Associations of Country-Specific and Sociodemographic Factors With Self-Reported COVID-19–Related Symptoms: Multivariable Analysis of Data From the CoronaCheck Mobile Health Platform

Elke Humer   ¹ , PD, PhD ;   Thomas Keil   ^{2, 3, 4} , Prof Dr ;   Carolin Stupp   ^{2, 3} ;   Winfried Schlee   ^{5, 6} , Prof Dr ;   Manfred Wildner   ^{3, 7} , Prof Dr ;   Peter Heuschmann   ^{2, 8} , Prof Dr ;   Michael Winter   ² , Dr rer nat ;   Thomas Probst   ^{1 *} , Prof Dr ;   Rüdiger Pryss   ^{2 *} , Prof Dr

¹ Department for Psychosomatic Medicine and Psychotherapy, University for Continuing Education Krems, Krems, Austria

² Institute of Clinical Epidemiology and Biometry, University of Würzburg, Würzburg, Germany

³ State Institute of Health, Bavarian Health and Food Safety Authority, Erlangen, Germany

⁴ Institute of Social Medicine, Epidemiology and Health Economics, Charité – Universitätsmedizin Berlin, Berlin, Germany

⁵ Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany

⁶ Eastern Switzerland University of Applied Sciences, St Gallen, Switzerland

⁷ Pettenkofer School of Public Health, University of Munich, Munich, Germany

⁸ Clinical Trial Center Würzburg, University Hospital Würzburg, Würzburg, Germany

*these authors contributed equally