Demographic description of 160 participants for which concurrent semi-structured interviews and GPS tracking were performed.

Phase 1 included individuals who used the GPS units at all times for 14 days and responded (on day 15) to a retrospective SSI, whereas Phase 2 included the same methods as Phase 1, but in addition individuals were interviewed on day 18 about any discordant information (i.e., locations on the SSI but not registered on the GPS, or vice versa).