. 2007 Mar 3;1:6. doi: 10.1186/1751-0759-1-6

Table 2.

Reliability and validity for the overall and individual scores on the 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	0.92^a
Subscales (number of items)
Dysphoria (8)	61.5 ± 27.1	0.94	0.88^a
Interference with activity (7)	66.4 ± 24.7	0.86	0.94^a
Body image (4)	82.9 ± 18.0	0.56	0.90^a
Health worry (3)	76.0 ± 18.6	0.48	0.81^a
Food avoidance (3)	59.5 ± 28.2	0.83	0.92^a
Social reaction (4)	78.2 ± 19.2	0.76	0.85^a
Sexual concerns (2)	84.7 ± 19.6	0.61	0.80^a
Relationships (3)	71.3 ± 25.6	0.74	0.87^a

^ap < 0.001; Pearson's correlation coefficient.