Table 3

Cox regression analysis of risk factors associated with mortality in patients with severe pelvic fractures

Variables	Univariate analysis			Multivariate analysis
Variables	HR	95% CI	P values	aHR	95% CI	P values
Age	1.012	1.001 to 1.023	0.032*	1.016	1.004 to 1.028	0.011*
Sex, male (reference)	1.000			1.000
Female	1.598	1.068 to 2.391	0.023*	1.252	0.816 to 1.923	0.304
SBP at admission	0.978	0.974 to 0.983	<0.001*	0.986	0.981 to 0.992	<0.001*
GCS at admission	0.82	0.785 to 0.856	<0.001*	0.887	0.838 to 0.938	<0.001*
Pelvic AIS	2.999	1.887 to 4.767	<0.001*	1.536	0.887 to 2.66	0.125
Head AIS	1.250	1.127 to 1.387	<0.001*	1.075	0.936 to 1.235	0.309
Thorax AIS	1.165	1.036 to 1.311	0.011*	0.981	0.825 to 1.167	0.829
Abdomen AIS	1.126	0.997 to 1.270	0.055	1.153	0.986 to 1.348	0.075
ISS	1.042	1.028 to 1.056	<0.001*	1.009	0.98 to 1.039	0.533
Transfer, yes (reference)	1.000			1.000
No	2.241	1.486 to 3.380	<0.001*	1.485	0.93 to 2.47	0.097
Dataset, NTDB (reference)	1.000			1.000
ATDB	1.321	0.868 to 2.010	0.194	1.562	0.992 to 2.46	0.054

The p value of the time-dependent Cox regression analysis was 0.077, and the −2 log likelihood (-2LL) values were 908.894 for the model.
*Statistically significant (p<0.05).
aHR, adjusted HR; AIS, Abbreviated Injury Scale; ATDB, Ajou Trauma Data Bank; xGCS, Glasgow Coma Scale; xISS, Injury Severity Score; xNTDB, National Trauma Data Bank; xSBP, systolic blood pressure