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Table 2 Reliability and validity for the overall and individual scores on the IBS-QOL-J

From: Translation and validation of a Japanese version of the irritable bowel syndrome-quality of life measure (IBS-QOL-J)

IBS-QOL Score (mean ± SD) (Time 1) Cronbach's alpha (Time 1) Intraclass correlation coefficient (ICC)
Overall scale 70.3 ± 19.9 0.96 0.92a
Subscales (number of items)    
   Dysphoria (8) 61.5 ± 27.1 0.94 0.88a
   Interference with activity (7) 66.4 ± 24.7 0.86 0.94a
   Body image (4) 82.9 ± 18.0 0.56 0.90a
   Health worry (3) 76.0 ± 18.6 0.48 0.81a
   Food avoidance (3) 59.5 ± 28.2 0.83 0.92a
   Social reaction (4) 78.2 ± 19.2 0.76 0.85a
   Sexual concerns (2) 84.7 ± 19.6 0.61 0.80a
   Relationships (3) 71.3 ± 25.6 0.74 0.87a
  1. ap < 0.001; Pearson's correlation coefficient.