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However, evidence for the efficacy of sound-based treatments is scarce. To elucidate the effect of sounds on tinnitus under real-world conditions, we collected data through the TrackYourTinnitus mobile platform over a ten-year period using Ecological Momentary Assessment and Mobile Crowdsensing. Using this dataset, we analyzed 67,442 samples from 572 users. Depending on the effect of environmental sounds on tinnitus, we identified three groups (T-, T+, T0) using Growth Mixture Modeling (GMM). Moreover, we compared these groups with respect to demographic, clinical, and user characteristics. We found that external sound reduces tinnitus (T-) in about 20% of users, increases tinnitus (T+) in about 5%, and leaves tinnitus unaffected (T0) in about 75%. 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The Lenox UG aims to translate scientific knowledge into e-health applications and also holds shares of the HealthStudyClub GmbH. Author WS received consulting fees as well as payments for lectures in connection with chronic tinnitus topics but declared no non-financial competing interests. R.P. received consulting fees, reimbursements for congress attendance, and travel expenses as well as payments for lectures in connection with mobile health and e-mental health topics but declares no non-financial competing interests. R.P. serves as Associate Editor of this journal and had no role in the peer review or decision to publish this manuscript. All other authors declare no financial or non-financial competing interests.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"162"}}