Table 3.

Predictors of posttraumatic stress disorder symptoms clinically significant improvement and treatment adherence (N=475).

Variable		PTSDa symptoms improvement		Treatment dose 8+ weeks
		ORb (95% CI)	P value	OR (95% CI)	P value
Demographics
	Age>35 years	0.79 (0.49-1.26)	.32	0.91 (0.45-1.90)	.80
	Education: Bachelor’s degree or higher	0.99 (0.64-1.54)	.97	2.13 (1.13-4.03)	.02
	Gender - female	1.31 (0.73-2.36)	.37	0.69 (0.26-1.69)	.44
	First therapy experience	2.03 (1.18-3.54)	.01	0.96 (0.44-2.23)	.92
Treatment characteristics
	Working alliance	1.03 (1.01-1.05)	.02	1.07 (1.03-1.10)	<.001
	Duration of treatment (weeks)	1.07 (0.98-1.17)	.13	N/Ac	N/A
	Latent class: acute/moderate improvement	5.19 (2.83-10.0)	<.001	1.68 (0.72-3.92)	.23
	Latent class: survey noncompletion	0.38 (0.20-0.69)	.002	0.58 (0.25-1.34)	.20
	Therapist: years of experience (10+)	1.44 (0.92-2.27)	.11	0.68 (0.35-1.36)	.27
	Therapist: PTSD expertise	0.76 (0.51-1.14)	.19	0.84 (0.44-1.55)	.57
Patient weekly engagement
	Number of messages	1.00 (0.98-1.01)	.64	1.08 (1.04-1.13)	<.001
	Text messages: number of words	1.00 (1.00-1.00)	.67	1.00 (1.00-1.00)	.07
	Audio messages: duration (min)	1.00 (1.00-1.00)	.52	1.00 (1.00-1.01)	.11
	Photo messages: count	0.83 (0.65-1.03)	.11	1.22 (0.82-2.14)	.40
	Video messages: duration (min)	1.02 (1.01-1.05)	.03	1.01 (0.99-1.04)	.47
Therapist weekly engagement
	Number of messages	1.01 (0.97-1.05)	.55	0.88 (0.82-0.94)	<.001
	Text messages: number of words	1.00 (1.00-1.00)	.52	1.00 (1.00-1.00)	<.001
	Audio messages: duration (min)	1.00 (1.00-1.00)	.92	1.00 (0.99-1.00)	.15
	Photo messages: count	1.17 (0.74-1.99)	.51	1.43 (0.82-3.18)	.28
	Video messages: duration (min)	0.98 (0.95-1.00)	.05	0.99 (0.96-1.02)	.43

^aPTSD: posttraumatic stress disorder.

^bOR: odds ratio.

^cN/A: not applicable.