Table 2.
Participant baseline characteristics. Averages across individuals are reported with standard deviations in parenthesis, except where indicated. Where appropriate, numbers represent the average across individuals of averages within individuals.
| Participant measure | Included participants with exit survey (n=47) |
Included participants with no exit survey (n=6) |
Excluded participants because of insufficient data (n=53) |
| Agea | 19.83 (1.99) | 20.33 (1.60) | 20.80 (4.13) |
| Female (number)a | 26 | 3 | 28 |
| BDI-20b score (entry)a | 11.14 (9.27) | 7.33 (3.54) | 12.61 (7.20) |
| BDI-20b score (exit)a | 11.98 (12.00) | N/A | N/A |
| Median mood rating | 5.17 (1.63) | 5.83 (0.90) | 5.44 (1.44) |
| Median energy rating | 5.60 (1.27) | 6.67 (0.94) | 5.98 (0.80) |
| Number of emotion surveys completed | 160.51 (44.42) | 139.33 (55.01) | 30.25 (50.97) |
| Number of days with emotion ratings | 49.45 (8.27) | 44.00 (11.06) | 10.49 (15.99) |
| Reported typical sleep duration in hours (from exit survey)a | 6.88 (1.35) | N/A | N/A |
| Average duration of inactive period in hours (sensed sleep duration) | 8.79 (1.22) | 8.56 (0.48) | N/A |
| Number of times per month a participant exercised (from exit survey)a | 4.24 (5.04) | N/A | N/A |
| Average minutes active per day (sensed daytime activity) | 118.78 (32.67) | 151.25 (59.68) | N/A |
| Number of days with sensed activity and mood input | 38.60 (9.15) | 40.00 (9.64) | 3.36 (5.15) |
aIndicates measures averaged only over submitted responses, as entry and exit survey questions were optional.
bBDI-20 indicates optional self-reports to 20 questions of the Beck’s Depression Inventory (the question related to suicidal ideation was omitted).