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Youth retention at wave 2 was 82.3% (395/480), while young adult retention was 76.18% (790/1037; P=.007). At wave 3, 72.18% (1095/1517) of the full sample completed the survey; again, youth had higher retention (366/480, 76.3%) than young adults (729/1037, 70.30%; P=.02). Overall, 70.20% (1,065/1517) completed all three waves of the study (74.0% [355/480] of youth and 68.47% [710/1037] of young adults; P=.03).
Retention did not differ by incentive condition at wave 2 (P=.28) or wave 3 (P=.59).
J Med Internet Res 2020;22(7):e18446
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