Table 5. Multiple regression analysis of the average total cost of hospitalization.

Variable	Coefficient	S.E	t-Statistics	P Value	Lower 95%CI	Upper 95%CI
Age	-0.001	0.002	-0.660	0.507	-0.005	0.002
Age square	0.000	0.000	2.87	0.004	0.000	0.000
Gender (Male = 1 Female = 0)	0.015	0.010	1.550	0.120	-0.004	0.035
Length of stay	0.032	0.000	68.460	<0.001	0.031	0.033
Number of hospital visits	0.002	0.001	1.330	0.184	-0.001	0.005
Method of medical payment
UEBMI	0.196	0.019	10.30	0.000	0.159	0.234
URBMI	0.068	0.019	3.550	0.000	0.031	0.106
Others	0.090	0.020	4.570	0.000	-0.126	-0.078
Pathway of Hospitalization
Outpatient	-0.102	0.012	-8.360	0.000	-0.126	-0.078
Others	-0.131	0.016	-8.090	0.000	-0.162	-0.099
Type of diabetes
Type 2	0.046	0.037	1.230	0.217	-0.027	0.118
Others	-0.019	0.041	-0.460	0.648	-0.099	0.062
CCI
CCI1	0.265	0.023	11.690	<0.001	0.221	0.310
CCI2	0.275	0.023	12.040	<0.001	0.230	0.320
CCI3	0.496	0.017	28.960	<0.001	0.463	0.530
Occupation
Farmer	-0.016	0.025	-0.650	0.518	-0.065	0.033
Retire	-0.047	0.026	-1.830	0.068	-0.097	0.003
Self-employment	-0.018	0.027	-0.660	0.506	-0.071	0.035
Employment	-0.019	0.038	-0.490	0.621	-0.093	0.056
Others	-0.142	0.028	-5.03	0.000	-0.198	-0.087
Marriage status
Married	-0.144	0.027	-5.360	0.000	-0.198	-0.092
Widowed	-0.143	0.037	-3.880	0.000	-0.216	-0.071
Divorced	-0.235	0.049	-4.860	0.000	-0.331	-0.141
Others	-0.254	0.040	-6.420	0.000	-0.331	-0.176
Hospital level
Secondary hospitals	0.365	0.038	9.610	<0.001	0.290	0.439
Tertiary hospitals	0.722	0.038	18.880	<0.001	0.647	0.797
Others	0.367	0.042	8.830	<0.001	0.286	0.449
cons	6.968	0.058	120.390	<0.001	6.854	7.081

S.E, standard error. 95%CI, 95% confidence interval. UEBMI, the basic medical insurance for urban employees; URBMI, the basic medical insurance for urban residents. CCI, the Charlson Comorbidity Index.