BMC Psychiatry

Table 2 Psychological test results for the treatment group (Interapy) and the waiting list control group (WLC) at pre-treatment and post-treatment and 3-months follow-up: Intention-to-Treat Analysis.

From: Internet-based treatment for PTSD reduces distress and facilitates the development of a strong therapeutic alliance: a randomized controlled clinical trial

									Groups × Pre-Post Effect
	Pre-test		Post-test		Follow-up		Effectsize Pre to Post	Effectsize Pre to 3-months	F	p
	M	SD	M	SD	M	SD
Intrusions IES-R
Treatment	23.0^a	(6.4)	12.3^b	(8.7)	12.7^b	(8.1)	1.40	1.41	F = 21.52	p < .001
Control	23.3^a	(7.89)	20.7^b	(9.2)	-	-	0.30
Aoidance IES-R
Treatment	19.9^a	(9.8)	10.1^b	(10.2)	9.7^b	(9.9)	.98	1.0	F = 10.00	p < .005
Control	19.0^a	(10.0)	16.0^b	(10.5)	-	-	0.29
Hyperarousal IES-R
Treatment	22.1^a	(6.5)	11.0^b	(9.0)	10.0^b	(8.5)	1.41	1.60	F = 25.49	p < .001
Control	19.1^a	(9.5)	16.5^b	(9.9)			0.27
Depression BSI
Treatment	10.1^a	(4.0)	5.3^b	(4.3)	4.9^b	(4.2)	1.16	1.27	F = 7.38	p < .05
Control	9.4^a	4.7	7.2^b	4.9			.46
Anxiety BSI
Treatment	9.1^a	(3.4)	5.2^b	(3.8)	4.7^b	(3.8)	1.08	1.22	F = 10.73	p < .001
Control	7.5^a	(4.7)	6.5^a	(4.7)			.21
Mental Health SF-12
Treatment	34.6^a	(5.6)	39.7^b	(7.4)	40.0^b	(7.6)	.77	.80	F = 5.95	p < .05
Control	35.5^a	(6.5)	36.9^a	(6.2)			.22
Physical Health SF-12
Treatment	46.7^a	(5.2)	47.2^a	(5.2 =	47.9^a	(5.0)	.10	.24	F = .001	n.s.
Control	46.0^a	(5.1)	46.6^a	(5.2)			.17

^a,b Means within a column which share a superscripts do not differ at p = 0.05 Note: Treatment group: n = 49, control group: n = 46

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