Table 4.

Multivariate analysis of factors for predicting accurate component position within Lewinnek’s zone (n = 958)

Factor	Reference category	OR (95% CI)	p value
Body mass index	≤ 24.99
25–29.99		1.78 (1.24–2.56)	0.002
30–34.99		1.53 (1.04–2.26)	0.033
35–39.99		2.07 (1.26–3.40)	0.004
≥ 40		—	0.87
Male sex	Female	1.40 (1.00 – 1.95)	0.05
Age, yr	≤ 50
50–70		—	0.36
≥ 70		—	0.55
Head size, mm	32mm
≤ 28		—	0.44
≥ 36		—	0.96
Outer cup diameter, mm	52–56mm
< 52		—	0.89
> 56		—	0.65

CI = confidence interval; OR = odds ratio.