Table 7.

Coefficients/estimates, standard errors (in brackets), and confidence intervals for the fixed effects of interest and random effects for the Patient Health Questionnaire–9 models.^a

Parameter		DAUb only, coefficient (SE), 95% CI	P value	ACEsc and DAU, coefficient (SE), 95% CI	P value
Fixed effects
	Intercept	9.57 (0.47), 8.65 to 10.49	<.001	6.98 (0.68), 5.65 to 8.31	<.001
	DAU	−0.08 (0.02), −0.11 to −0.05	<.001	−0.06 (0.02), −0.11 to −0.01	.01
	ACE	N/Ad	N/A	1.02 (0.20), 0.62 to 1.41	<.001
	ACEs × DAU	N/A	N/A	−0.01 (0.01), −0.02 to 0.01	.32
Variance components
	Residual	8.60 (0.75), 7.24 to 10.21	N/A	8.58 (0.75), 7.22 to 10.18	N/A
	Intercept	26.79 (0.75), 20.77 to 34.57	N/A	22.52 (2.98), 17.37 to 29.20	N/A

^aThe number of observations in these models at level 1 (timepoint) is 417; at level 2 (participant) it is 155.

^bDAU: days of app usage.

^cACEs: adverse childhood experiences.

^dN/A: not applicable.