JPH JMIR Public Health Surveill JMIR Public Health and Surveillance 2369-2960 JMIR Publications Toronto, Canada v8i8e36861 35980728 10.2196/36861 Original Paper Original Paper Development and Validation of Indicators for Population Injury Surveillance in Hong Kong: Development and Usability Study Khader Yousef Kemler Ellen Trevino Jesus Tung Keith T S PhD 1 https://orcid.org/0000-0001-6647-4346 Wong Rosa S PhD 1 https://orcid.org/0000-0001-5808-7629 Ho Frederick K PhD 2 https://orcid.org/0000-0001-7190-9025 Chan Ko Ling PhD 3 https://orcid.org/0000-0001-8508-9224 Wong Wilfred H S PhD 1 https://orcid.org/0000-0001-8396-2368 Leung Hugo IB 1 https://orcid.org/0000-0002-5108-3681 Leung Ming PhD 4 https://orcid.org/0000-0001-7899-3872 Leung Gilberto K K PhD 5 https://orcid.org/0000-0003-3147-3057 Chow Chun Bong MD 1 https://orcid.org/0000-0002-5675-7972 Ip Patrick MPH 1
Department of Paediatrics and Adolescent Medicine The University of Hong Kong NCB 123, Queen Mary Hospital Hong Kong Hong Kong 852 22554089 852 22554090 patricip@hku.hk
https://orcid.org/0000-0002-6797-6898 Department of Paediatrics and Adolescent Medicine The University of Hong Kong Hong Kong Hong Kong Institute of Health and Wellbeing University of Glasgow Glasgow United Kingdom Department of Applied Social Sciences The Hong Kong Polytechnic University Hong Kong Hong Kong Accident and Emergency Department Princess Margaret Hospital Hong Kong Hong Kong Department of Surgery The University of Hong Kong Hong Kong Hong Kong Corresponding Author: Patrick Ip patricip@hku.hk 8 2022 18 8 2022 8 8 e36861 28 1 2022 1 4 2022 26 5 2022 9 6 2022 ©Keith T S Tung, Rosa S Wong, Frederick K Ho, Ko Ling Chan, Wilfred H S Wong, Hugo Leung, Ming Leung, Gilberto K K Leung, Chun Bong Chow, Patrick Ip. Originally published in JMIR Public Health and Surveillance (https://publichealth.jmir.org), 18.08.2022. 2022

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 Background

Injury is an increasingly pressing global health issue. An effective surveillance system is required to monitor the trends and burden of injuries.

 Objective

This study aimed to identify a set of valid and context-specific injury indicators to facilitate the establishment of an injury surveillance program in Hong Kong.

 Methods

This development of indicators adopted a multiphased modified Delphi research design. A literature search was conducted on academic databases using injury-related search terms in various combinations. A list of potential indicators was sent to a panel of experts from various backgrounds to rate the validity and context-specificity of these indicators. Local hospital data on the selected core indicators were used to examine their applicability in the context of Hong Kong.

 Results

We reviewed 142 articles and identified 55 indicators, which were classified into 4 domains. On the basis of the ratings by the expert panel, 13 indicators were selected as core indicators because of their good validity and high relevance to the local context. Among these indicators, 10 were from the construct of health care service use, and 3 were from the construct of postdischarge outcomes. Regression analyses of local hospitalization data showed that the Hong Kong Safe Community certification status had no association with 5 core indicators (admission to intensive care unit, mortality rate, length of intensive care unit stay, need for a rehabilitation facility, and long-term behavioral and emotional outcomes), negative associations with 4 core indicators (operative intervention, infection rate, length of hospitalization, and disability-adjusted life years), and positive associations with the remaining 4 core indicators (attendance to accident and emergency department, discharge rate, suicide rate, and hospitalization rate after attending the accident and emergency department). These results confirmed the validity of the selected core indicators for the quantification of injury burden and evaluation of injury-related services, although some indicators may better measure the consequences of severe injuries.

 Conclusions

This study developed a set of injury outcome indicators that would be useful for monitoring injury trends and burdens in Hong Kong.

 injury indicators modified Delphi research design surveillance Introduction

Injuries, including both unintentional injuries and violence, are serious public health threats that accounts for approximately 10% of the world’s fatalities [1]. Similar to other countries, injuries are a significant public health problem in Hong Kong. Injuries have consistently been among the top 5 causes of mortality since 2001 and accounted for approximately 1850 registered deaths in 2019 [2]. In addition, at least 6.2% of the population has experienced functional impairment resulting from at least one episode of unintentional injury [3]. Injuries were also found to be the leading cause of death in the age group of 1 to 14 years over the past decades [2].

Thus, it is important to develop robust strategies to monitor and prevent injuries. However, quantification of the injury burden is a challenging process because of considerable variations in injury mechanisms, duration, and outcomes [4,5]. This process should be guided by a set of measurable injury indicators [6,7]. Broadly, indicators are defined as derivatives of primary data that provide information and describe the state of a phenomenon to a degree of significance beyond raw measurements [8]. Establishing a set of injury indicators would provide a standardized tool to estimate the local injury burden and increase the validity and comparability of these estimates between populations [9].

As the occurrence of injuries partly depends on environmental and social factors [4,5], injury patterns could vary substantially, even within the same population and across regions [10]. The use of local context-specific indicators is recommended to standardize the definitions of injuries and increase the reliability and representativeness of the results in reflecting the injury situation at the population level [11]. Country-specific sets of indicators have been established in Western countries, including Canada, the Netherlands, and the United Kingdom [6,12,13]. However, there has been no comprehensive review of the injury indicators specific to Hong Kong. Hong Kong has 18 districts, each with unique demographic, environmental, and socioeconomic characteristics. It is also known for extremely high–living density multistory apartments, and thus, its injury patterns could be different from those in other regions. Therefore, this study aimed to develop a valid set of Hong Kong–specific injury indicators through a multi-phased modified Delphi research design. The resulting insights would be beneficial for the planning, implementation, and evaluation of injury surveillance and prevention programs [14]. The surveillance system, in turn, can provide information for the early identification of warning signs of injuries and timely intervention for individuals who may be at risk of a physical or psychological injury, ultimately reducing health care use and spending at both individual and societal levels [6,7].

 Methods Ethics Approval

The study protocol was approved by the Institutional Review Board of the Hospital Authority, Hong Kong West Cluster (reference UW 15-549). Informed consent was not required from participants as all data provided by the Clinical Data Analysis and Reporting System (CDARS) were deidentified.

 Study Design Overview

The development of injury indicators adopted a multiphase modified Delphi research design, as described in previous studies [6,7]. Individuals can first express their opinions impersonally, followed by a whole-group discussion to reach a consensus [15]. The Delphi process emphasizes collective expert opinions rather than precise analytical techniques [16], which makes it particularly suitable for studying population-level research questions or problems. Although the original Delphi process includes a series of iterative steps to collect aggregated expert opinions through multiple rounds of questionnaires, the modified version adopted in our study initiated the discussion with a list of carefully preselected items to facilitate the process of reaching consensus. Following the modified Delphi process protocol, 5 phases were involved: (1) searching and reviewing relevant studies from academic databases, (2) extracting potential indicators from identified studies, (3) achieving a consensus opinion among experts on locally relevant indicators, (4) specification of the selected indicators, and (5) applicability testing of the selected indicators using local health data.

 Phase 1: Searching and Reviewing Relevant Studies

A scoping review was conducted to identify previously adopted valid injury indicators by summarizing the evidence from the included studies that met the prespecified inclusion criteria [17]. This is an evidence-based method to create a rich database as groundwork for further research or review and has been used in previous studies to investigate different research questions and topics [18,19]. Specifically, a literature search was conducted to identify existing outcome indicators for all types of injuries that require medical attention, both intentional and unintentional, from academic databases, including ProQuest, Web of Science, PubMed, Ovid, PsycINFO, and Google Scholar. Guided by the International Classification of Diseases-9), which focuses on the consequences of injuries, the following search terms were combined in various ways to perform the search: burns, poisoning, dislocations, drowning, road traffic accident, facial trauma, head trauma, internal injury of thorax, abdomen and pelvis, fracture, internal injury, injury to nerves, injury to spinal cord, open wounds, falls, blunt injury, suicide, self-harm, self-inflicted injury, injury, outcome, consequence, intentional, unintentional, psychological, mental health, mental disorders, Abbreviated Injury Scale, Glasgow Coma Score, Injury Severity Scale, and disability.

The articles included in this review met the following inclusion criteria: (1) having an injury case definition, (2) including at least one indicator of outcome after injury, (3) providing possible data source or sources for the indicator or indicators, (4) being published in an academic peer-reviewed journal, and (5) written in English.

 Phase 2: Extracting Potential Indicators From Selected Studies

The aim of this phase was to extract relevant information from the selected studies for subsequent expert reviews. The extracted information included the study year, type of injury, severity of the injury, study population, outcome indicators, and type of study. All the data were recorded and compiled in a spreadsheet for further analysis. Data extraction was conducted by trained research assistants under the supervision of experienced researchers from various fields, including social sciences, medicine, statistics, and biology. The purpose of including a cross-disciplinary and diverse research team was to ensure the accuracy of extracted information. On the basis of their characteristics and measurement purpose, the indicators identified from the literature were grouped into 4 constructs: health care service use, functional and psychological outcomes, biological and physiological outcomes, and postdischarge outcomes.

 Phase 3: Achieving Consensus Opinion Among Experts on Locally Relevant Indicators

The indicators identified in the literature were considered suitable for potential use in Hong Kong. The list of potential indicators identified by the research team was sent to a panel of 18 experts in the field of injury for evaluation. Experts from different sectors, including the government, academia, health care, and the community, are well recognized for their work and contributions to injury measures, data management, and community safety and prevention programs. A 22-item checklist adopted from Pike et al [6] and the Child Health Indicators of Life and Development project [20] was used to evaluate the validity, consistency, local relevance, and sensitivity of the potential indicators. The evaluation process involves 2 steps. The first step was a web-based survey inviting experts to view and rate the indicators according to checklist criteria. The second step was face-to-face discussion to resolve disagreements among experts [21]. For each indicator, the response of YES denotes satisfactory fulfillment of the specific criterion, whereas the response of NO denotes a failure to fulfill that criterion. Indicators receiving YES for ≥11 prespecified criteria from more than half of the panel members were deemed as the core locally relevant injury indicators. In addition, panel members were asked to propose other suitable indicators to be included in the list. The newly proposed indicators are then circulated among the panel members for a second round of review.

 Phase 4: Specification of Selected Indicators

In this phase, core indicators were clearly defined and specified by the research team according to the specification format adopted from previously published reports on injury indicators [22-24]. Each indicator has its own specification items, including the definition of the indicator and relevant terms, justification for its inclusion, operational definition of a case, method and tools for calculation, data sources and availability, units of measurement, and limitations.

 Phase 5: Applicability Testing of Selected Indicators Using Local Health Data

The applicability of these core indicators was evaluated through a series of regression analyses using local health data. Regression analyses were conducted to test the associations between core indicators and certification of the Hong Kong Safe Community in different districts in Hong Kong. The Safe Community model aims to promote safety through the prevention of accidents and injuries through cross-sectorial collaboration in the community [25]. To be certified as a Hong Kong Safe Community, the district must fulfill the following six criteria: (1) establishment of community safety policy, (2) establishment of Safe Community organization, (3) identification of community safety needs, (4) implementation of community safety programs, (5) evaluation of community safety programs, and (6) sharing of safety community experience [25]. Previous studies have demonstrated a reduction in injury incidence after the implementation of the Safe Community model [26,27]. To test the applicability of the core indicators for the quantification of injury burden, all data concerning accident and emergency department (AED) attendance (based on a trauma flag entered by nurses) and hospitalization (based on International Classification of Diseases-9 codes) attributable to injuries during the period from January 1, 2001, to December 31, 2016, were extracted from the CDARS. The CDARS is a territory-wide electronic health record database managed by the Hospital Authority, which is the official governing body of all public hospitals in Hong Kong. All AED attendance and inpatient records of the Hong Kong local public hospitals are housed in the CDARS. A difference-in-differences comparison was adopted in our multivariable regression models to examine the effects of the Hong Kong Safe Community model. The time-varying injury indicator variables were the outcomes. The rate indicators were modeled using a negative binomial model with the log-transformed population during that period to be the offsets. Continuous indicators were modeled using linear regression models. The primary independent variable of interest was a time-varying binary variable with 0 and 1 indicating pre and post–Safe Community implementation. The overall year trend was adjusted for in the model as a continuous variable. This approach can help minimize the temporal influences on injury incidence in Hong Kong.

 Results Phase 1 to Phase 2

The initial literature search in phase 1 identified 3525 records. Among these 3525 records, 142 (4.03%) met our prespecified inclusion criteria and were included in the review process (Figure 1). From the 142 reviewed articles, we identified 55 injury outcome indicators and categorized them into 4 constructs based on their characteristics: functional and psychological outcomes (19/55, 35% indicators), health care service use (17/55, 31% indicators), postdischarge outcomes (10/55, 18% indicators), and biological and physiological outcomes (9/55, 16% indicators). Owing to the high heterogeneity of information within the construct of functional and psychological outcomes, indicators in this construct were further divided into 5 subcategories: integrated outcomes (6/19, 32% indicators), lower limbs (5/19, 26% indicators), cognitive (3/19, 16% indicators), psychiatric (3/19, 16% indicators), and upper limbs (2/19, 11% indicators). In contrast, as most indicators in the construct of biological and physiological outcomes were injury specific, they were further regrouped into 9 broad categories based on their similarities to expedite the expert review process. Table 1 displays all indicators identified from the literature by the research team.

Flow diagram of the scoping review.

Potential injury outcome indicators under the 4 constructs.

Indicator Definition
Health care service use indicators
Operative intervention [28-44] The percentage of cases that requires operative intervention within a particular year
Infection rates [28,45-53] The percentage of cases that have any type of infection within a particular year
Admission rate to ICUa [30,32,33,35,38,44,54-67] The percentage of cases admitted to the ICU within a particular year
Immediate mortality rate [32,33,35-41,44-46,50,54-60,62,64-66,68-105] The cause-specific death rate per 100,000 population within a particular year
Length of ICU stay [40,44,61,62,64,67,90,98,103,106] The average number of days spent in the ICU within a particular year
Length of hospitalization [30,31,33,34,36,40-42,44-48,50,52,54-56,61-64,68,71,72,75,76,78,87,90,98,99,103-117] The average number of days spent in hospital for a particular year
Admission rate to AEDb [43,66,69,100-102,117-121] The cause-specific admission rate to the AED per 100,000 population for a particular year
Time for wound healing [50,109] Average amount of time required for the healing of injury-induced open wounds within 1 particular year
Need for rehabilitation facility [30] Total number of cases that need to be referred to an inpatient rehabilitation facility within a particular year
Hospitalization rate after leaving AED [30,35,38,53-55,58,60,61,66,69,77,83,100-102,105,107,108,111,117-120,122,123] The percentage of cases that require inpatient hospital admissions after leaving AED per 100,000 population within a particular year
Intubation duration [30,52,62,64,80,90,103] The average number of days that the cases require intubation, a process of inserting through the mouth into the airway to assist with their breathing, within a particular year
Need for secondary procedures [31-34,48,115] The percentage of cases that need secondary surgical procedures within a particular year
Mean duration of operation [37] The average amount of time needed for the operative intervention conducted within a particular year
Presence of complications [32,33,36,37,46,49,51,58,63,78,86,92,106,109,113-115,124,125] The percentage of cases that have injury-induced complications within a particular year
Morbidity [46,60,83-85,88,95] The frequency of having any injury-induced disease or medical condition within a particular year
Discharge rate [70,80,97-99,105,117,120,126] The percentage of cases discharged from the hospital within a particular year
Need for nursing facility [89] Total number of cases discharged to a nursing facility within a particular year
Functional and psychological outcome indicators
Cognitive outcomes
Gray Oral Reading Test [127] An efficient and objective measure of growth in oral reading fluency and comprehension and an aid in the diagnosis of oral reading difficulties
Cognitive Performance Scale [89,106] A scale used for accessing patients’ loss in everyday cognitive performance from independent to full dependency based on 5 domains: daily decision-making, eating self-performance, ability to make self-understood, short-term memory, and being comatose
Stanford-Binet Intelligence Scale [127] A cognitive ability and intelligence test used to diagnose developmental or intellectual deficiencies based on 5 factors: knowledge, quantitative reasoning, visual-spatial processing, working memory, and fluid reasoning
Psychiatric outcomes
Structured Clinical Interview for DSM-5c or other related mental health scales [112,117,121,128-131] A semistructured interview guide for making DSM-5 diagnoses or other mental health scales not stated
General Health Questionnaire [132] A screening device for identifying minor psychiatric disorders in the general population and within the community or nonpsychiatric clinical settings such as primary care or general medical outpatients
Health Status Questionnaire [29,109,133-135] A scale for measuring health-related quality of life, including physical functioning, role limitations owing to physical problems, bodily pain, general health perceptions, vitality, social functioning, role limitations because of emotional problems, and mental health
Upper limb outcomes
American Shoulder and Elbow Surgeons Evaluation [136] A standardized method for assessing patient-rated shoulder pain and function or disability
Disabilities of the Arm, Shoulder, and Hand Questionnaire [137] A region-specific outcome instrument developed as a measure of physical function and symptoms in patients with any or several musculoskeletal disorders of the upper limb
Lower limb outcomes
Walking Index for Spinal Cord Injury [138] A research tool in clinical trials to measure improvements in walking in person with acute and chronic spinal cord injury
Lysholm score and Tegner Activity scale [139] A scale used for measuring patients’ everyday activity limitations and participation restrictions before and after arthroscopic knee surgery
American Knee Society score [140] A scale used with patients with osteoarthritis or who have undergone total knee arthroplasty for measuring patients’ functionality and their knee clinically through physical examination
Foot and Ankle Outcome score [28,141] A scale used with patients with lateral ankle instability, Achilles tendinosis, and plantar fasciitis for assessing foot and ankle pain, symptoms, function in daily living, sport and recreation, and foot- and ankle-related quality of life
American Spinal Injury Association Impairment scale [28] A scale used by the rehabilitation team to assess the sensory and motor levels that were affected by the spinal cord injury
Integrated outcomes
Neurological impairment [59,60,83,142,143] A broad group of disorders in which the central nervous system does not function properly and leads to some form of physical or mental problems
Musculoskeletal Function Assessment [29,124,137] An instrument used with a range of patients with musculoskeletal disorders for measuring their health status, including lower and upper mobility, activity level and satisfaction, social support, pain, emotional status, and quality of life, in clinical practice
Functional Independence Measure [98,127,135,144] A basic indicator of patient disability and the amount of assistance required for the patient to conduct activities of daily living in 18 categories, focusing on motor and cognitive function
Grading Medical Impairment [145] Grading rules used for assessing the medical impairment and functional reduction originating from an injury using patients’ medical records before and after the injury
Glasgow Outcome Scale [41,81,94,96,125-127,146-149] A global scale used with patients with brain injuries for rating function outcomes into 5 ordered categories: dead, vegetative state, severe disability, moderate disability, or good recovery
Range of motion [89,98,114,137,139,141] The measurement of movement around a specific joint or body part
Biological and physiological outcome indicators
Duration of antibiotic use [34] The number of days in which individuals are prescribed to receive antibiotic treatment because of injury
Hematological findings [32,58,70,113] Laboratory tests on examining the blood content such as hormones, ions, lactates, and inflammatory mediators in the blood
Cardiovascular findings [32,39,50,81,86,91,92,95,106,113] Any measures or tests performed related to heart or blood vessels, such as arterial blood pressure, heart rate, and initial heart rhythm
Histological findings [45] Results of examination of tissue specimens under a microscope to study the manifestations of a disease
Renal findings [45,58,150] Laboratory tests on evaluating kidney function using blood or urine samples, mainly blood urea nitrogen and creatinine
Toxicological findings [52,116,125,150-152] Laboratory tests on the type and quantity of substances present in an individual’s body, such as urine toxicology screening
Metabolic measurements [32,45,70,116,125,152-154] Measurements related to individuals’ metabolism, such as resting energy expenditure and rewarming speed
Osteological signs [28,48,49,62,88,104,118,124,137,155,156] Laboratory tests on the structure and function of bones, such as bone measurements and bone mineral density test
Neurological signs and findings [41,42,51,52,58,59,63,80,83,86,92,97,104,106,116,142-144,148,157] A series of tests and measures in examining the function of the brain and the central and autonomic nervous systems, such as intracranial pressure, computed tomography scans, magnetic resonance imaging scans, and cerebral angiography
Postdischarge outcomes
Long-term behavioral and emotional outcomes [67,135,147,155,158-162] The long-term outcomes of emotions and behaviors characterized by alteration of feeling tone and by physiological behavioral changes
Social dependency [163,164] Capacities necessary for the performance of everyday self-care competence, mobility competence, and social competence
Possibility of posttraumatic stress disorder or other mental disorders [55,67,97,131,132,135,148,151,159,162,164-166] The possibility of having mental illnesses that affect one’s mood, thinking, and behavior after experiencing a shocking, scary, or dangerous event
Presence or absence of disabilities [32,48-50,56,66,74,82,93,101,103,134,135,167] The presence of disabilities, which refer to impairments, activity limitations, and participation restrictions
Suicide rate [43,121,159] The number of people taking their own life after injury per 100,000 population in a period
Effect on employment or studies [79,106,134,135,140,147,159,161,168] The consequences of the injury on one’s work life and study life
Walking distance [28,138] The distance a person is able to walk in a period, such as the 6-minute walk test
Quality of life [28,67,70,88,110,111,124,133-136,144,151,162,163,167,169] The overall enjoyment of life, including aspects of an individual’s sense of well-being, ability to perform various activities, and quality of life with domains of physical functioning, role physical, bodily pain, general health, vitality, social functioning, role emotional, and mental health
Disability-adjusted life year [67,135,162] A measure expressed as the number of years lost because of ill health, disability, or early death used to reflect the overall disease burden
Quality-adjusted life year [67,135,162] A measure used to reflect the overall disease burden by considering both the quality and quantity of the life lived

aICU: intensive care unit.

bAED: accident and emergency department.

cDSM-5: Diagnostic and Statistical Manual of Mental Disorders (fifth edition).

 Phase 3 to Phase 4

After review and discussion among the expert panel members, 13 core indicators were identified from the list. The core indicators included the need for operative intervention, infection rate, admission to the intensive care unit (ICU), mortality rate, length of ICU stay, length of hospitalization, AED attendance rate, need for a rehabilitation facility, hospitalization rate after AED, discharge rate, long-term behavioral and emotional outcomes, suicide rate, and disability-adjusted life years (DALYs) per 100,000. Among these 13 indicators, 10 (77%) were from the construct of health care service use and 3 (23%) were from the construct of postdischarge outcomes.

 Phase 5

Table 2 displays the results of the multivariable regression analyses of the associations between core indicators and certified Hong Kong Safe Community status. Applicability tests showed that the Hong Kong Safe Community certification status was not associated with 5 core indicators (admission to ICU, mortality rate, length of ICU stay, need for a rehabilitation facility, and long-term behavioral and emotional outcomes), negatively associated with 4 core indicators (operative intervention, infection rate, length of hospitalization, and DALYs), and positively associated with the remaining 4 core indicators (attendance to AED, discharge rate, suicide rate, and hospitalization rate after attending AED). For example, the Safe Community model implementation was found to reduce the risk of AED attendance (risk ratio=0.65; P<.001) and to lower the DALYs per 100,000 (β=−1.91; P=.046). These results confirmed the data availability, applicability, and local relevance of the selected core indicators.

Applicability testing of injury outcome indicators (illustrated by multivariable regression analyses).

Injury outcome indicators Certified Hong Kong Safe Community
Effect (95% CI)a P value
Operative intervention, β −.23 (−0.40 to −0.07) .007b
Infection rates, β (ICD-9CMc 680-686d) −.18 (−0.33 to −0.02) .03e
Admission to ICUf, β .04 (−0.02 to 0.11) .21
Mortality rate, risk ratio 1.29 (0.98 to 1.69) .07
Length of stay in ICU, β −0.02 (−0.08 to 0.04) .54
Length of hospitalization, β −1.09 (−1.63 to −0.54) <.001g
Attendance to AEDh, risk ratio 0.65 (0.64 to 0.65) <.001g
Need for a rehabilitation facility, β (based on discharge destinationi) .00 (0.00 to 0.00) .38
Hospitalization rate after attending AED, β 1.34 (0.47 to 2.22) .003b
Discharge rate, β .09 (0.04 to 0.15) .001b
Long-term behavioral and emotional outcomes, β (proxy measure: ICD-9CM 905-909j) −0.03 (−0.17 to 0.10) .64
Suicide rate, risk ratio 1.23 (1.00 to 1.50) .045e
DALYsk per 100,000, β −1.91 (−3.79 to −0.04) .046e

aAdjusted for sex and year of attendance as covariates and district and age groups as random intercepts.

bP<.01.

cICD-9CM: International Classification of Diseases, Ninth Revision, Clinical Modification.

dInfections of skin and subcutaneous tissue.

eP<.05.

fICU: intensive care unit.

gP<.001.

hAED: accident and emergency department.

iDestination to MacMehose Medical Rehabilitation Centre, Cheshire House (Sha Tin, Chun Hom Kok).

jLate effects of injuries, poisonings, toxic effects, and other external causes.

kDALY: disability-adjusted life year.

 Discussion Principal Findings

This study used a multiphased modified Delphi approach to develop a set of core injury outcome indicators specific to the Hong Kong population. These identified indicators have the potential to become standardized tools for the surveillance and evaluation of injury burden and management services in Hong Kong. Specifically, we identified 55 injury outcome indicators from the literature and categorized them into 4 domains: health care service use, functional and psychological outcomes, biological and physiological outcomes, and postdischarge outcomes. On the scoring and ranking by panel experts on data availability, applicability, and validity, 13 indicators were ranked as core indicators because of their high local relevance and reflectiveness of the injury burden in Hong Kong. In addition, we used local hospitalization data to perform applicability testing analyses. These findings support the applicability of these core indicators in local contexts. They would serve as the groundwork for the future establishment of a comprehensive injury surveillance system in Hong Kong, as well as an example of a systematic approach for developing and validating indicators for injury surveillance.

By reviewing the relevant literature, we found that the most common injury outcome construct was health care service use. Approximately 57.7% (82/142) of the reviewed articles used measures of health care service use as indicators of injury outcomes compared with 31.7% (45/142) for functional and psychological outcomes, 21.8% (31/142) for postdischarge outcomes, and 14.8% (21/142) for biological and physiological outcomes. This could be because most measures included in the health care service use construct, such as length of hospitalization, length of stay in ICU, and immediate death status, are frequently used as injury indicators in many countries [54,55,68,69].

It should be noted that other outcome indicator constructs also have their own characteristics. From a clinical perspective, functional and psychological and biological and physiological outcomes can provide information on the holistic impact of an injury on patients. Notably, many functional and psychological outcomes were measured using standardized and psychometrically validated scales or indexes such as the General Health Questionnaire and Glasgow Outcome Scale, which can increase the comparability of results between studies and across countries [170]. Conversely, the biological and physiological construct is difficult to compare, because of its injury-specific and heterogeneous nature. For example, Kraft et al [45] assessed the level of blood hormones in patients with burn injuries, whereas Alanazi et al [153] assessed the level of blood ions in poisoned patients. Owing to these between-study differences in biological outcome measures, we could not compare and determine which injury type may have caused a greater physiological burden on the patient. Thus, it is important to reach a consensus on the most appropriate and readily measurable injury indicators at the biological and physiological level. For instance, some evidence has suggested that injury-associated inflammation is a potentially universal phenomenon among injuries [171-173]. Future research should identify the injury type associated with severe biological and physiological damage and compare inflammatory marker levels (eg, interleukins) between injuries to characterize their respective inflammatory profiles and to examine whether postinjury functional and inflammatory changes would correlate with each other.

Moreover, injury outcome indicators can be time specific. For example, previous studies measured quality of life as an indicator of patients’ perceived outcomes immediately after injury [28,70]. However, considering the fluctuation in the quality of life over time, local experts recommended DALYs and quality-adjusted life years as indicators of outcomes after discharge from the hospital. In addition, there could be overlaps between the domains of injury outcome indicators. More studies are needed to clarify the associations among functional and psychological outcomes, biological and physiological outcomes, and other long-term postinjury outcomes.

From the list of potential indicators, 13 indicators were rated by a panel of experts as suitable for local use. Surprisingly, certification of a Safe Community was associated with higher suicide rates, perhaps as the primary goal of the Safe Community program was to prevent unintentional injuries [25,174], and therefore might be less effective in reducing intentional injuries such as suicidal behaviors. The increase in suicide rate may affect the patterns of estimates of other indicators, as it is often related to more serious consequences and complications [175]. For example, the rate of hospitalization following AED attendance was higher in districts with a Safe Community certification, which could be because of the increased number of suicide cases. In addition, although the estimates of universal injury indicators (eg, length of hospitalization) were reduced in certified Hong Kong Safe Communities, severe injury indicators (eg, mortality rate and ICU admission) showed no differences between districts with and without Safe Community certification. These results suggest that the estimates of severe injury indicators could be influenced by other unmeasured factors than safety measures.

This study developed a set of injury indicators that can be used to evaluate and monitor injury trends and services in Hong Kong. It is evident that a well-established injury surveillance system integrating different data sources can be a valuable tool to assist health care professionals in making better decisions regarding injury trends and preventive services [174,176]. Having demonstrated their functionality and applicability to the context of Hong Kong, health care professionals can use these indicators to develop a better understanding of local injury trends and obtain a more accurate estimate of the impact of injuries on the local health care system. However, challenges exist because of the lack of reliable, sensitive, and standardized data sources for some indicators in Hong Kong [177]. Although the literature review identified indicators in 4 constructs (health care service use, functional and psychological outcomes, biological and physiological outcomes, and postdischarge outcomes), only health care service use and postdischarge outcome indicators were found to have limited applicability as severe injuries are relatively rare in Hong Kong. These findings indicate a lack of postinjury data in local surveillance systems. Moreover, functional and psychological and biological and physiological measures should be integrated as part of routine clinical care for injured patients in Hong Kong. The inclusion of these indicators can help establish a more comprehensive surveillance system to evaluate and monitor injury trends and services more accurately in Hong Kong. Furthermore, assessment methods and tools should be standardized to enhance comparability with other regions.

This study had several limitations. First, gray literature such as government reports was not searched in the review process; hence, we may have missed some relevant indicators, although we consulted experts to confirm whether our list included all important indicators. Second, the Hong Kong Safe Community model was not the most appropriate model for testing the validity of the core injury outcome indicators, as the model cannot address issues related to intentional injuries such as suicide and abuse, which often result in severe consequences and complications. Third, owing to the lack of appropriate data sources in Hong Kong, we could not include all identified injury outcome indicator constructs in the final list of core indicators, which limits the generalizability of the results to other populations.

 Conclusions

This study used a multiphased modified Delphi method to develop a set of indicators to monitor injury trends and burdens in Hong Kong. A total of 55 injury outcome indicators were identified through a literature review and discussed among local experts from different sectors, including the government, health care, community, and academia. A total of 13 indicators were included in the final list of core indicators; however, biological and physiological and functional and psychological outcomes were not included because of the lack of data sources. Model testing results based on a set of core indicator data showed that these core indicators can be applied to Hong Kong settings. The approach used in this study will be a useful example for other cities and regions that aim to systematically tackle the injury burden.

 Abbreviations AED

accident and emergency department

 CDARS

Clinical Data Analysis and Reporting System

 DALY

disability-adjusted life year

 ICU

intensive care unit

Funding for this study was provided by the Health and Medical Research Fund (reference 13142541). The Health and Medical Research Fund had no role in the study design, collection, analysis, or interpretation of the data, writing of the manuscript, or decision to submit the paper for publication.

The authors would like to thank all the professionals, academics, and experts in the field for their valuable feedback and contributions to this study.

None declared.

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