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International survey about the prevalence of mental and physical symptoms

This study investigates the prevalence of certain symptoms (including psychological, physical, cognitive and sexual symptoms, e.g. headaches, weight gain or loss, dizziness, nightmares, inhibited sexuel desire, anxiety, restlessness) in different countries


Dear participants,


we would like to thank you for your interest in this study. With your participation you are helping us to get a better understanding of mental illnesses and its treatments. Furthermore you are supporting me with my doctoral thesis at the University of Witten/Herdecke.


Aim of the study:

The aim of this study is to gather and compare experiences and changes of symptoms in different populations. Participating is voluntary. Your data will be collected anonymously and treated confidentialy. Please note that the following questions refer to personal health conditions. In case you start to feel uncomfortable while completing the questionnaire, you can rescind the study without giving a reason.

The study will take approximately 20 to 45 minutes to complete. Unfortunately, an interruption is not possible.

At the end of the survey you can specify whether you want to participate in a raffle of 5 vouchers worth 20€ from an online shop of your choice.

Who can participate?

You can participate in this study if...

  • you have reached the age of majority (i.e. this depends on your country)

  • you speak English fluently

  • you have not participated in the online study "Häufigkeit von Symptomen in der Bundesrepublik Deutschland"

Questions, comments, complaints:

  • If you have any questions, comments or complaints after you completed this study, you can contact us via mail (

  • If you feel very stressed because of the symptoms, please contact your doctor or psychotherapist

  • In case of an emergency, please contact a local psychiatric emergency room.

Other options:

  • USA

    • National Suicide Prevention Lifeline: 800.273.8255

    • Postpartum Support Intl.: 800.944.4773

    • National Hopeline Network: 800.442.4673

    • Disaster Distress Helpline: 800.985.5990

  • UK and Ireland

    • Samaritans: 116 123 (for UK and Ireland)

    • SOS Silence of Suicide: 0300 1020 505 (4pm to midnight every day) (UK only)

  • Australia

    • Lifeline: 131 114

  • India

    • National Suicide Prevention Helpline: 1800 121 3667

  • Canada

    • Canada Suicide Prevention Service: 1.833.456.4566

  • New Zealand

    • Suicide Crisis Helpline: 0508 828 865

    • Lifeline 24/7 Helpline: 0800 543 354

  • South Africa

    • Lifeline Southern Africa: 0861 322 322

    • Befrienders South Africa: 051 444 5691


This survey is anonymous.

The record of your survey responses does not contain any identifying information about you, unless a specific survey question explicitly asked for it.

If you used an identifying token to access this survey, please rest assured that this token will not be stored together with your responses. It is managed in a separate database and will only be updated to indicate whether you did (or did not) complete this survey. There is no way of matching identification tokens with survey responses.