Table 4.

Cox proportional hazards regression of independent predictors of reoperation following treatment for a proximal humeral fracture

	All reoperations			Major reoperations
Risk factor	p-value	Exp(B)	(95%CI)	p-value	Exp(B)	(95% CI)
Age (≤ 59 years as reference)
60–74	0.4	0.86	(0.63–1.2)	0.5	1.2	(0.78–1.7)
75–84	< 0.001	0.37	(0.23–0.59)	0.04	0.57	(0.34–0.96)
≥ 85	0.007	0.50	(0.30–0.83)	0.5	0.84	(0.49–1.5)
Sex (male as reference)
Female	0.8	1.0	(0.93–1.8)	0.8	0.95	(0.67–1.4)
AO/OTA group (Group A as reference)
Group B	0.1	1.3	(0.93–1.8)	0.02	1.6	(1.1–2.4)
Group C	< 0.001	4.9	(3.5–6.8)	0.001	5.7	(3.8–8.4)
Injury mechanism a (high-energy trauma as reference)
Low-energy trauma	0.2	0.71	(0.43–1.2)	0.3	0.71	(0.38–1.3)

AO/OTA group, see Table 1

^a 87 fractures excluded due to unknown (71) or inapplicable (16) trauma mechanism.