A new study into user attitudes towards wearables found that health tracking is the most popular use of this electronics category. 36% of those polled reported concerns that these functions may not live up to reality, however. 10% of the respondents also said they worried about data security on these devices.
https://www.notebookcheck.net/Fitness-tracker-users-are-found-to-worry-that-their-devices-may-not-be-accurate-enough.439961.0.html