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Table 3 Continuous outcome measures

From: Acceptability, effectiveness, and cost-effectiveness of internet-based exposure treatment for irritable bowel syndrome in a clinical sample: a randomized controlled trial

  Treatment Waiting list Effect size Mixed models
  n m SD n m SD Cohen's d(95% CI) Effect B p
GSRS-IBS           
Pre 30 44.6 11.1 31 39.8 12.0   Group 4.9 .12
Post 23 31.0 10.2 27 40.9 14.5 0.77 (0.19 - 1.34) Time 0.6 .63
FU 19 29.9 12.6      G×T -11.7 .001
IBS-QOL           
Pre 30 67.4 20.9 31 76.1 18.8   Group -8.8 .09
Post 23 82.6 13.4 27 67.4 23.1 0.79 (0.20-1.35) Time -7.2 .001
FU 20 87.6 11.8      G×T 16.6 .001
VSI           
Pre 30 32.5 18.0 31 27.5 16.3   Group 5.0 .22
Post 23 14.1 15.1 27 26.2 17.9 0.73 (0.14 - 1.29) Time -11.7 .01
FU 20 15.5 15.9      G×T -14.6 .001
         COV 0.3 .03
Sheehan Disability Scales           
Pre 30 11.9 8.1 31 8.7 6.3   Group 3.2 .08
Post 23 6.4 6.7 27 7.8 7.6 0.19 (-0.37 - 0.75) Time -4.4 .01
FU 20 5.2 6.6      G×T -4.2 .002
         COV 0.1 .04
  1. Unstandardized (B) coefficients and their p-values are given for fixed in effects in linear mixed models using all data from pre-treatment and post-treatment and all individuals (n = 61). The coefficient associated with the main effect of group denotes average score difference between the groups at the pre-treatment assessment. The coefficient associated with the effect of time denotes the average change score from pre to post-treatment across both groups. The coefficient associated with the effect of G × T (group × time) denotes the difference between groups in change score from pre- to post-treatment. COV is the effect of the pre-treatment value of GSRS-IBS, as a retained covariate in the model, on the post-treatment value. Group0 = Treatment Group, Group1 = Waiting List, Time0 = Pre-treatment, and Time1 = Post-treatment. Effect sizes are calculated as standardized mean difference (Cohen's d) at post-treatment. GSRS-IBS: Gastrointestinal symptom rating scale-IBS version. IBS-QOL: The Irritable Bowel Syndrome Quality of Life Instrument (IBS-QOL). VSI: The Visceral Sensitivity Index.