Table 1.

Characteristics of samples compared with population of patients (2009–2010) [21, 22]

Characteristic	Hip replacement		Knee replacement
	Sample	Population	Sample	Population
Sex: female (%)	136 (67)	(61)	152 (61)	(57)
Age—mean (SD)	69.1 (12.4)	67.7	68.7 (9.0)	68.7
Living arrangements (%)
With family/friends	65	72	70	75
Alone	34	28	29	25
Other	1	0	1	0
Duration of symptoms (%)
0–5 year	79	81	45	57
> 5 years	21	19	55	44
Primary operation (%)	91	90	90	92
Disease-specific PROM Q1—mean (SD)	15.1 (8.7)	18.2	17.4 (8.2)	19.3
EQ-5D-3L Q1—mean (SD)	0.24 (0.33)	0.36	0.35 (0.32)	0.43