Assessing Validity of the Fitbit Indicators for U.S. Public Health Surveillance

Personally generated health data are increasingly used to report on population prevalence and trends, providing a new avenue for public health surveillance. Documentation of acceptable measurement properties to ensure correct interpretations should precede their use. One common source of personally generated health data comes from activity trackers, self-worn devices that provide feedback and long-term tracking on physical activity-related metrics. Activity trackers are relatively unobtrusive and low cost, with 12.5% of U.S.