Table 2.

Performance metrics of each daily activity model in the test set.

Model fit metrics	Any app activity	Physical activity (exercises and steps)	Lessons (article reading)	Social activity (group posts and coach messages)	Weigh-ins
AUROCa (95% CI)	0.99 (0.99-0.99)	0.98 (0.98-0.98)	0.99 (0.99-0.99)	0.98 (0.98-0.98)	0.94 (0.94-0.94)
AUPRCb (95% CI)	0.98 (0.98-0.98)	0.74 (0.72-0.75)	0.91 (0.91-0.92)	0.74 (0.73-0.75)	0.65 (0.63-0.66)
Brier score (95% CI)	0.037 (0.036-0.038)	0.025 (0.025-0.026)	0.027 (0.026-0.028)	0.02 (0.023-0.024)	0.051 (0.050-0.052)

^aAUROC: area under the receiver operating characteristic curve.

^bAUPRC: area under the precision-recall curve.