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Table 4 Known-groups validity according to IBS severity classification

From: Irritable bowel syndrome-specific health-related quality of life instrument: development and psychometric evaluation

  Classification of IBS severity F Post-hoc test Effect size (η 2)
Mild Moderate Severe
(n = 101) (n = 115) (n = 45)
Mean ± SD Mean ± SD Mean ± SD
Total 2.97 ± 0.70 2.22 ± 0.83 1.81 ± 0.90 41.79a* Mild>Moderate, Severeb 0.24
F1 2.42 ± 0.90 1.57 ± 0.94 1.22 ± 0.97 34.49* Mild>Moderate>Severec 0.21
F2 3.11 ± 0.80 2.28 ± 1.00 1.71 ± 0.94 46.84a* Mild>Moderate, Severeb 0.25
F3 3.14 ± 1.03 2.49 ± 1.27 2.15 ± 1.31 14.22a* Mild>Moderate, Severeb 0.10
F4 3.20 ± 0.83 2.54 ± 1.13 2.17 ± 1.16 21.04a* Mild>Moderate>Severeb 0.13
  1. Factor 1, bowel function; Factor 2, emotions; Factor 3, concerns about social activity; Factor 4, consideration of foods
  2. aWelch test; bGames-Howell test; cScheffé’s test
  3. *p < 0.001