Table 7.

Test–retest reliability based on intra-class correlation in 11 stable Crohn’s disease (CD) and 9 ulcerative colitis (UC) participants.

Instrument	Intraclass Correlation (95% CI) in CD Based on wPCDAI Health Status (n = 11)	Intraclass Correlation (95% CI) in UC Based on PUCAI Health Status (n = 9)
CHU9D (adult tariffs)	0.844 (0.54, 0.955) *	0.455 (−0.174, 0.839)
CHU9D (youth tariffs)	0.889 (0.613, 0.97) *	0.476 (−0.154, 0.847)
HUI2	0.706 (0.223, 0.911) *	−0.0783 (−0.643, 0.573)
HUI3	0.886 (0.587, 0.969) *	−0.103 (−0.692, 0.567)

Values less than 0.5 are indicative of poor reliability, values between 0.5 and 0.75 indicate moderate reliability, values between 0.75 and 0.9 indicate good reliability, and values greater than 0.90 indicate excellent reliability. For the correlations, * indicates p-value < 0.05. SD = standard deviation, wPCDAI = weighted Pediatric Crohn’s Disease Activity Index, PUCAI = Pediatric Ulcerative Colitis Activity Index.