Table 4.

Anxiety symptom trajectories and time-varying effects of engagement with elements of blended care therapy^a.

	Model 1		Model 2			Model 3
	b (95% CI)	P value	b (95% CI)	P value	b (95% CI)		P value
Intercept	11.50 (11.45 to 11.54)	<.001	11.92 (11.87 to 11.97)	<.001	12.10 (12.05 to 12.15)		<.001
Weeks	–1.23 (–1.24 to –1.22)	<.001	–1.17 (–1.18 to –1.15)	<.001	–1.05 (–1.06 to –1.03)		<.001
Weeks²	0.06 (0.06 to 0.06)	<.001	0.05 (0.05 to 0.05)	<.001	0.04 (0.04 to 0.05)		<.001
Therapy sessions last 7 days	N/Ab	N/A	–0.70 (–0.73 to –0.67)	<.001	–0.82 (–0.85 to –0.78)		<.001
Digital lessons last 7 days	N/A	N/A	–0.20 (–0.24 to –0.17)	<.001	–0.18 (–0.22 to –0.15)		<.001
Digital exercises last 7 days	N/A	N/A	–0.13 (–0.17 to –0.09)	<.001	0.00 (–0.04 to 0.04)		.89
Provider feedback last 7 days	N/A	N/A	–0.21 (–0.26 to –0.17)	<.001	–0.12 (–0.16 to –0.08)		<.001
Therapy sessions 8-14 days	N/A	N/A	N/A	N/A	–0.58 (–0.61 to –0.54)		<.001
Digital lessons 8-14 days	N/A	N/A	N/A	N/A	–0.26 (–0.30 to –0.22)		<.001
Digital exercises 8-14 days	N/A	N/A	N/A	N/A	–0.10 (–0.14 to –0.06)		<.001
Provider feedback 8-14 days	N/A	N/A	N/A	N/A	–0.07 (–0.12 to –0.02)		.004
Deviance (–2LLc)	1,059,750	N/A	1,056,354	N/A	1,054,123		N/A
AICd	1,059,772	N/A	1,056,384	N/A	1,054,161		N/A
BICe	1,059,884	N/A	1,056,536	N/A	1,054,355		N/A

^aThe outcome of interest was client scores on the Generalized Anxiety Disorder 7-item scale (GAD-7). The analyzed sample included 30,006 individuals with a baseline GAD-7 score ≥8. df_residual=196,023 for model 1, df_residual=196,019 for model 2, and df_residual=196,015 for model 3.

^bNot applicable.

^c–2LL: –2 × log likelihood.

^dAIC: Akaike information criterion.

^eBIC: Bayesian information criterion.