Table 4. Follow-Up Results for Primary and Secondary Outcomes.

	Pretreatment score			Pretreatment slope vs posttreatment slope			Pretreatment slope vs follow-up slope			Effect size
	Intercept	t Value	df a	Slope (SE)	t Value	df a	Slope (SE)	t Value	df a	Cohen d (90% CI)b
Primary outcomes
PCL-5 score	50.64	25.13	179	−28.10 (2.56)c	−10.96	128	−39.51 (2.56)c	−15.40	128	1.28 (1.01-1.56)
PHQ-somatic score	21.92	34.69	174	−5.77 (0.79)c	−7.24	127	−6.57 (0.79)c	−8.32	126	0.62 (0.39-0.84)
PHQ-depression score	24.71	29.32	162	−8.41 (1.01)c	−8.34	127	−11.64 (1.00)c	−11.64	126	0.91 (0.67-1.15)
PHQ-anxiety score	16.84	34.16	172	−5.04 (0.61)c	−8.19	128	−6.67 (0.61)c	−10.93	127	0.84 (0.60-1.09)
Secondary outcomes
ODSIS score	12.71	21.03	178	−8.43 (0.78)c	−10.78	127	−10.40 (0.78)c	−13.23	127	1.12 (0.84-1.35)
OASIS score	12.57	22.26	185	−8.59 (0.74)c	−11.51	127	−9.44 (0.74)c	−12.59	128	1.09 (0.86-1.39)
QLESQ score	43.16	38.89	157	8.64 (1.27)c	6.79	127	14.07 (1.27)c	11.05	127	0.82 (0.58-1.06)
WHODAS score	1.30	12.72	152	−0.52 (0.13)c	−4.02	120	−0.36 (0.12)c	−3.02	114	0.29 (0.07-0.55)

Abbreviations: OASIS, Overall Anxiety Severity and Impairment Scale; ODSIS, Overall Depression Severity and Impairment Scale; PCL-5, posttraumatic stress disorder checklist for DSM-5; PHQ, Patient Health Questionnaire; QLESQ, Quality-of -Life Enjoyment and Satisfaction Questionnaire; WHODAS, World Health Organization Disability Assessment Scale.

^a df and P values are derived with the Satterthwaite method.

^b The Cohen d effect sizes presented are transformations of η² P to a more common effect size measure (interpretation: 0.2 small, 0.5 medium, 0.8 large).

^c P < .001.