Table 2. Descriptive statistics, internal consistency (expressed by Cronbach’s alpha), and test-retest reliability (expressed by ICC, SEM, and MDC95%) of the HOOS.

	Baseline (n=202)		Retest (n=57)			ICC (n=57)
	Median	IQR	Median	IQR	Cronbach's alpha (n=202)	ICC	95% CI	SEM (n=57)	MDC95% (n=57)
Symptoms (5 items)	35.0	25.0-55.0	40.0	35.0-50.0	0.76	0.78	0.63-0.88	5.6	15.6
Pain (10 items)	30.0	17.5-42.5	32.5	12.5-40.0	0.94	0.86	0.77-0.91	5.1	14.0
ADL (17 items)	29.4	19.1-45.6	33.8	13.2-41.2	0.96	0.85	0.72-0.92	5.4	15.1
Sport/Rec (4 items)	12.5	6.25-25.0	12.5	0-25.0	0.87	0.77	0.61-0.87	6.7	18.6
QoL (4 items)	12.5	6.3-25.0	12.5	6.3-31.3	0.78	0.82	0.71-0.89	6.1	16.9
Total (40 items)	25.5	16.2-36.3	25.3	16.1-35.1	0.98	0.84	0.74-0.90	4.1	11.4
ICC: Intraclass correlation coefficient; SEM: Standard error of measurement; MDC: Minimal detectable change; HOOS: Hip Disability and Osteoarthritis Outcome Score; IQR: Interquartile range; CI: Confidence interval; ADL: Activities of daily living; Sport/Rec: Sport and recreation; QoL: Quality of life.