Table 2.

Linear mixed modeling predicting PHQ-9^a scores^b.

		Estimate (95% CI; SE)	t test	P value
Intercept		10.48 (9.50 to 11.45;0.50)	21.14	<.001
Group allocation
	Control group	Reference
	Treatment group	1.06 (–0.31 to 2.43; 0.70)	1.52	.13
Time		–0.49 (–0.73 to –0.26; 0.12)	–4.09	<.001
Group×Time		–0.68 (–1.00 to –0.35; 0.17)	–4.09	<.001

^aPHQ-9: Patient Health Questionnaire-9.

^bTime codes represent the sequential order of assessments: 0 for the baseline, 1 for the first in-app assessment, and so on, culminating with 6 for the posttest assessment. Each assessment was performed approximately 2 weeks apart.