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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 23.0a (6.4) 12.3b (8.7) 12.7b (8.1) 1.40 1.41 F = 21.52 p < .001
Control 23.3a (7.89) 20.7b (9.2) - - 0.30    
Aoidance IES-R           
Treatment 19.9a (9.8) 10.1b (10.2) 9.7b (9.9) .98 1.0 F = 10.00 p < .005
Control 19.0a (10.0) 16.0b (10.5) - - 0.29    
Hyperarousal IES-R           
Treatment 22.1a (6.5) 11.0b (9.0) 10.0b (8.5) 1.41 1.60 F = 25.49 p < .001
Control 19.1a (9.5) 16.5b (9.9)    0.27    
Depression BSI           
Treatment 10.1a (4.0) 5.3b (4.3) 4.9b (4.2) 1.16 1.27 F = 7.38 p < .05
Control 9.4a 4.7 7.2b 4.9    .46    
Anxiety BSI           
Treatment 9.1a (3.4) 5.2b (3.8) 4.7b (3.8) 1.08 1.22 F = 10.73 p < .001
Control 7.5a (4.7) 6.5a (4.7)    .21    
Mental Health SF-12           
Treatment 34.6a (5.6) 39.7b (7.4) 40.0b (7.6) .77 .80 F = 5.95 p < .05
Control 35.5a (6.5) 36.9a (6.2)    .22    
Physical Health SF-12           
Treatment 46.7a (5.2) 47.2a (5.2 = 47.9a (5.0) .10 .24 F = .001 n.s.
Control 46.0a (5.1) 46.6a (5.2)    .17    
  1. 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