Table 2.

Results of a generalised linear model with gamma distribution

Variables	β	SE	P value	EXP (β)	95% CI
Gender
Male	Reference			1
Female	−0.065	0.019	0.002**	0.937	0.903 to 0.972
LOS	0.022	0.000	<0.001***	1.022	1.021 to 1.023
Mortality
Death	Reference			1
Alive	0.268	0.041	<0.001***	1.308	1.208 to 1.419
Splenic injury grade
Ⅰ/Ⅱ	Reference			1
Ⅲ/Ⅳ	0.074	0.021	<0.001***	1.077	1.034 to 1.121
Ⅴ	0.190	0.034	<0.001***	1.208	1.132 to 1.291
Management
NOM	Reference			1
OM	0.431	0.023	<0.001***	1.539	1.474 to 1.605
ICU
No	Reference			1
Yes	0.444	0.024	<0.001***	1.559	1.488 to 1.633
Blood transfusion>2
No	Reference			1
Yes	0.440	0.016	<0.001***	1.553	1.506 to 1.602
Age
<18	Reference			1
18–40	0.242	0.026	<0.001***	1.274	1.211 to 1.339
41–65	0.299	0.027	<0.001***	1.349	1.277 to 1.423
>65	0.347	0.053	<0.001***	1.414	1.275 to 1.572
NISS
<15	Reference			1
15–25	0.024	0.017	0.154	1.024	0.991 to 1.058
>25	0.055	0.021	0.095**	1.056	1.014 to 1.100
Hospital
Secondary hospitals	Reference			1
Tertiary hospitals	0.351	0.018	<0.001***	1.420	1.370 to 1.471
Year
2000	Reference			1
2001	0.049	0.046	0.279	1.05	0.960 to 1.148
2002	0.268	0.046	<0.001***	1.308	1.195 to 1.429
2003	0.397	0.045	<0.001***	1.488	1.360 to 1.624
2004	0.416	0.046	<0.001***	1.516	1.395 to 1.657
2005	0.474	0.046	<0.001***	1.606	1.466 to 1.757
2006	0.447	0.045	<0.001***	1.563	1.429 to 1.707
2007	0.413	0.045	<0.001***	1.511	1.381 to 1.650
2008	0.392	0.046	<0.001***	1.480	1.351 to 1.618
2009	0.569	0.069	<0.001***	1.766	1.544 to 2.023
2010	0.526	0.076	<0.001***	1.693	1.461 to 1.968
2011	0.596	0.073	<0.001***	1.816	1.575 to 2.099
2012	0.688	0.071	<0.001***	1.991	1.735 to 2.289
2013	0.616	0.079	<0.001***	1.851	1.589 to 2.165

**P<0.01, ***p<0.001.

Exp(B), exponential of coefficients; ICU, intensive care unit; LOS, length of stay; NISS, New Injury Severity Score; NOM, non-OM; OM, operative management.