For simple screening for anxiety disorders, the 7-item Generalized Anxiety Questionnaire is commonly used in mobile health applications. This mobile apps provides a sample implementation of the standard GAD-7 questionnaire.
There are many published academic papers regarding this questionnaire. The classic reference is listed here:
https://jamanetwork.com/journals/jamainternalmedicine/article-abstract/410326

By itself, this mobile app does not collect or share any data with a server. But this app can be used together with ANOTHER mobile app that is designed to collect data and store it in a secure database as part of a clinical study.
As an example, the GAD-7 questionnaire can be used together with the Diabetes Screener mobile app that provides database support and send data to a remote server. You can view the Diabetes Screener mobile app in this link:
https://play.google.com/store/apps/details?id=com.mobiletechnologylab.diabetes_screener&hl=en_US&gl=US

If you wish to use this mobile app as part of a clinical study using smart phone data collection, please contact our lab for more information.

Thank you.

Contact:
-- Rich Fletcher ([email protected])