Table 3.

Results of binary logistic regression model of predictors for IHDs

Variable	β Coefficient	SE	OR	95 % CI	p
IHDs before surgery
Constant	-0.522	0.179	0.593	-	0.003
Age (reference: under 50 years)
50–59 years	0.378	0.252	1.459	[0.891, 2.391]	0.134
60–69 years	0.774	0.295	2.167	[1.217, 3.862]	0.009
Over 69 years	-0.143	0.544	0.866	[0.298, 2.517]	0.792
Overlength of stay	2.609	0.414	13.584	[6.039, 30.556]	0.000
IHDs after surgery
Constant	-2.673	0.691	0.069	-	0.000
Use of ventilators	0.488	0.353	1.629	[0.815, 3.257]	0.167
Admission from outpatient	1.843	0.679	6.315	[1.669, 23.897]	0.007
Multiple diagnosis	0.501	0.221	1.65	[1.07, 2.544]	0.023
Higher surgical incision level	0.696	0.226	2.007	[1.288, 3.127]	0.002
Overlength of stay	1.805	0.329	6.08	[3.191, 11.585]	0.000
IHDs for whole hospitalization
Constant	-1.01	0.577	0.364	-	0.08
Age (reference: under 50 years)
50–59 years	0.502	0.294	1.653	[0.929, 2.94]	0.087
60–69 years	0.932	0.372	2.541	[1.226, 5.264]	0.012
Over 69 years	0.693	0.667	2	[0.541, 7.386]	0.299
Admission from outpatient	1.603	0.56	5.142	[1.421, 18.614]	0.004
Higher surgical incision level	0.391	0.262	1.479	[0.884, 2.472]	0.136
Overlength of stay	2.402	0.741	11.041	[2.586, 47.138]	0.001

Notes: SE Standard error; OR Odds ratio; CI Confidence interval