Trauma-focused treatment for posttraumatic stress disorder combined with CBT for severe substance use disorder: a randomized controlled trial

Table 3 Descriptive analyses for PTSD for intent to treat sample (N = 34) (estimated values)

Variable (primary outcome measures)	TAU + SWT (A) (N = 19)				TAU (B) (N = 15)				GLM	Partial η ²	Contrast	Partial η ²	GLM	Partial η ²	GLM	partial bη ²
	pre	mid	post	fu	pre	mid	post	fu	Time	Time	1 pre-mid	1 pre-mid	condition	condition	*Time condition**	*Time condition**
											2 mid-post	2 mid-post
											3 post-fu	3 post-fu
PDS total: *M (SD)*	30.4 (9.7)	28.2 (9.0)	17.6 (12.0)	23.5 (14.8)	28.3 (10.7)	26.5 (9.8)	24.3 (9.1)	21.7 (9.4)	A + B **	0.166	1 A ns B ns	A 0.036 B 0.037	ns	0.000	ns	0.059
											2 A * B ns	A 0.341 B 0.040
											3 A ns B ns	A 0.143 B 0.062
									McN χ ²	OR ³			Fisher t ⁴	φ ⁵
SCID (PTSD) n (%)
PTSD	19 (100)	-	9.8 (51.8)	-	15 (100)	-	13.2 (88.0)	-	A*	0			-	−0.390	-	-
PTSD									B	0
Partial & Full-blown									B	0
Partial PTSD	10 (52.6)	-	2.8 (14.7)	-	3 (20.0)	-	2.4 (16.0)	-	A*	0.1			-	−0.028	-	-
Partial PTSD	10 (52.6)	-	2.8 (14.7)	-	3 (20.0)	-	2.4 (16.0)	-	B	0.8			-	−0.028	-	-
Full-blown PTSD	9 (47.4)	-	7 (36.8)	-	12 (80.0)	-	10.8 (72.0)	-	A	0.7			-	−0.353	-	-
									B	0.8

Note. PTSD Posttraumatic Stress Disorder, TAU Treatment as usual, SWT Structured Writing Therapy, PDS Posttraumatic Diagnostic Scale, SCID Structured Clinical Interview of DSM IV, PTSD Posttraumatic stress disorder, A = TAU + SWT. B = TAU. pre pre-treatment, mid mid-treatment, post post-treatment, Fu follow up. McN χ² = McNemars χ². OR odds ratio, Pl Con planned contrasts.
*p <0.05 **p < 0.001. t trend, ns not significant.
³OR = increase of cases/ decrease of cases.
⁴Overall Fisher’s excact test was calculated for PTSD diagnosis (p = 0.06).
φ ⁵ Phi (measure of effectsize).

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