Table 2.

Quantiles and Cronbach’s α on individual domain scores (n = 82)

Questionnaire/domain (no. of questions)	Quantiles					Cronbach’s α
	0%	25%	50%	75%	100%
SRS-22
Function/activity	40	88	96	100	100	0.85
Pain	48	79	88	95	100	0.83
Self-image/appearance	36	72	80	87	100	0.75
Mental health	48	75	86	96	100	0.81
Satisfaction with management	40	60	80	90	100	0.61
SF-36
Physical functioning	30	72.5	85	95	100	0.84
Role-physical	0	50	87.5	100	100	0.83
Bodily pain	32.5	55	90	100	100	0.80
General health perceptions	25	52.5	65	85	100	0.72
Vitality	20	50	62.5	75	100	0.72
Social functioning	25	50	62.5	100	100	0.73
Role-emotional	0	58.33	91.67	100	100	0.79
Mental health index	20	55	70	85	100	0.81