Table 4.

Cox regression analysis of risk of death

Factor	Univarible analysis HR (CI)	Multivariable analysis HR (CI)
Age
Per 1 year increase	1.07 (1.05–1.08)	1.05 (1.03–1.07)
Sex
Female	1	1
Male	1.1 (0.83–1.7)	1.6 (1.1–2.4)
ASA score
1–2	1	1
3–4	5.7 (3.8–8.4)	3.7 (2.4–5.7)
Hours to surgery
< 12	1	1
12–24	1.4 (0.88–2.4)	1.4 (0.85–2.2)
24–36	1.3 (0.64–2.5)	1.1 (0.58–2.3)
> 36	2.2 (1.1–4.1)	1.3 (0.65–2.6)
Test for overall effect	p = 0.2	p = 0.6
Cortical thickness index
Per 0.1 increase	0.58 (0.48–0.71)	0.72 (0.58–0.89)
Fracture type
Mildly displaced	1	1
Severely displaced	0.89 (0.62–1.3)	1.6 (1.1–2.5)
Reduction a
Fully reduced	1	1
Partly reduced	1.2 (0.68–2.2)	0.91 (0.48–1.7)
Not reduced	1.3 (0.84–1.9)	1.1 (0.69–1.7)
Test for overall effect	p = 0.5	p = 0.9
Angle of implants to the lateral cortex of the femoral shaft in AP
> 125°	1	1
≤ 125°	0.94 (0.38–2.3)	0.85 (0.34–2.1)
Protrusion of implant
No protrusion	1	1
Protrusion	1.3 (0.47–3.5)	2.0 (0.72–5.5)

^aSee footnotes Table 2.