Table 4.

Risk factors for 7-day, 30-day, 180-day and 1-year mortality using Cox regression analysis with adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs)

		7-days			30-days			180-days			1-year
	aHR	(95% CI)	P	aHR	(95% CI)	P	aHR	(95% CI)	P	aHR	(95% CI)	P
Fixation method (Ref: Uncemented)
Cemented	1.76	1.23–2.51	0.002	1.36	1.17–1.58	< 0.001	1.16	1.08–1.26	< 0.001	1.11	1.04–1.18	0.001
Gender (Ref: Female)
Male	1.52	1.10–2.12	0.012	1.68	1.46–1.93	< 0.001	1.75	1.62–1.88	< 0.001	1.75	1.65–1.86	< 0.001
Age group (Ref: 80–84 years)
85–89 years	1.64	1.13–2.39	0.009	1.47	1.25–1.74	< 0.001	1.39	1.28–1.51	< 0.001	1.31	1.23–1.40	< 0.001
≥ 90 years	2.02	1.32–3.08	0.001	2.31	1.94–2.75	< 0.001	2.03	1.85–2.23	< 0.001	1.89	1.76–2.04	< 0.001
Insurance status (Ref: ≥US $840)
< US $840	0.92	0.65–1.29	0.612	0.93	0.81–1.08	0.345	1.04	0.97–1.13	0.271	1.06	0.99–1.12	0.077
CCI score (Ref: CCI = 0)
CCI ≥ 1	1.31	0.86–2.01	0.211	1.55	1.28–1.88	< 0.001	1.62	1.46–1.80	< 0.001	1.55	1.44–1.68	< 0.001
Type of head (Ref: BHA)
UHA	1.03	0.73–1.46	0.855	0.93	0.81–1.09	0.373	0.97	0.90–1.05	0.435	0.99	0.93–1.05	0.703
Hospital type (Ref: Private)
Public	0.88	0.62–1.24	0.461	0.94	0.81–1.10	0.446	0.97	0.90–1.05	0.437	1.00	0.94–1.06	0.895
Hospital level (Ref: Medical centre)
Non-medical centre	0.89	0.55–1.46	0.652	1.10	0.89–1.35	0.388	1.03	0.92–1.15	0.578	1.00	0.92–1.09	0.973
Hospital volume (Ref: High)
Low	1.28	0.80–2.05	0.296	1.05	0.87–1.28	0.596	1.16	1.05–1.29	0.004	1.15	1.06–1.24	0.001
Surgeon volume (Ref: High)
Low	1.22	0.85–1.73	0.280	1.22	1.05–1.42	0.011	1.16	1.07–1.25	< 0.001	1.19	1.12–1.27	< 0.001