Table 3.

Factors associated with LOS by multiple linear regression analysis

Factors	Reference group	ß	Std. Error	95% C.I		P-value
				Lower	Upper
Gender
Female	Male	0.165	0.319	−0.459	0.790	0.604
Age group
30~	20~	1.339	1.761	−2.112	4.790	0.447
40~		2.091	1.612	−1.069	5.252	0.195
50~		0.591	1.616	−2.577	3.758	0.715
60~		1.325	1.642	−1.893	4.543	0.420
70~		2.856	1.645	−0.368	6.081	0.083
80~		5.161	1.671	1.887	8.435	0.002
90~		8.328	2.157	4.101	12.555	0.001
Type of medical insurance
Urban Employee Basic Medical Insurance	Urban Resident Basic Medical Insurance	−0.050	0.921	−1.856	1.756	0.957
Other		2.541	1.486	−0.372	5.454	0.087
Public expense		2.250	1.383	−0.460	4.961	0.104
Private expense		1.489	0.919	−0.311	3.290	0.105
NCMS		3.053	1.265	0.574	5.531	0.016
Occupation
Labourer	Employee	0.118	0.577	−1.014	1.249	0.839
Retired		0.843	0.483	−0.104	1.790	0.081
Unemployed		0.506	0.471	−0.416	1.429	0.282
Mode of Admission
Outpatient	Emergency	1.331	1.079	−0.784	3.445	0.217
Other		0.348	1.507	−2.605	3.301	0.817
Complications
Chronic complications	No complications	−1.678	0.548	−2.751	−0.605	0.002
Acute + chronic complications		−2.475	0.753	−3.951	−0.998	0.001

The occupation “student” was not included in the multiple linear regression analysis because the sample size was limited to 3