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Participant characteristics.
| Cohort | App version | n | Age (years), mean (SD) | Male gender, n (%) | Has smartphone experience, n (%) | Years of education, mean (SD) |
| PreventIT study | 1 | 189 | 66.3 (2.4) | 90 (47.4) | 157 (83.1) |
15.6 (4.6) |
| PreventIT study | 2 | 134 | 66.3 (2.5) | 64 (47.8) | 108 (80.0) | 15.9 (4.8) |
| Summative usability evaluation | 3 | 20 | 68.7 (5.2) | 11 (55.0) | 20 (100.0) | —a |
aData were not collected.
