Table 1.

Basic characteristics of the study population, showing the absolute numbers (%) for proportions and mean (SD) for continuous variables

Variable	Complete (n = 27,245)	Missing (n = 7,274)
Female	15,619 (57%)	4,118 (57%)
Age	69 (10)	69 (11)
Pain VAS, mm	62 (16)	64 (16)
Charnley class
A	12,697 (47%)	1,059 (41%)
B	3,341 (12%)	333 (13%)
C	11,207 (41%)	1,186 (46%)
EQ-5D
Preoperatively	0.73 (0.11)	0.71 (0.12)
Postoperatively	0.88 (0.11)	0.87 (0.12)
EQ VAS
Preoperatively	54 (22)	51 (22)
Postoperatively	76 (20)	74 (21)