Table 3.

Univariate and unconditional multiple logistic regression analysis of the association of demographic and clinical characteristics of patients admitted for all MDCs (excluding HIV/AIDS) with long hospital stay

	Hospital stay over threshold (HSOT)	Hospital stay in threshold	p value	Crude OR (95%CI)		Adjusted bOR (95%CI)
Males	493	7861	<0.41a	1
Females	315	5283		1.01	0.87-1.17	0.88	0.74-1.03
Italian born people (Ref)	660	12181	<0.0001 a	1		1
Foreign born people	148	956		2.86	2.36-3.45	1.22	0.96-1.54
Class of age			<0.0001 a
15-24 years (ref)	48	1079		1		1
25-34 years	116	2452		1.13	0.76-1.69	1.15	0.74-1.78
35-44 years	112	2485		1.19	0.80-1.77	0.85	0.54-1.32
45-54 years	123	1689		2.02	1.36-2.99	1.19	0.76-1.84
55-64 years	119	1656		1.92	1.30-2.85	1.02	0.65-1.59
65-74 years	167	1980		2.35	1.61-3.42	1.10	0.72-1.70
> 74 years	184	2279		2.34	1.61-3.40	1.08	0.70-1.75
N of ICD-9 codes
1 (ref)	118	4063	<0.0001 a	1		1
2	122	3755		1.50	1.11-2.02	1.16	0.85-1.58
3	163	2684		2.83	2.14-3.75	1.87	1.38-2.54
4	169	1709		4.74	3.58-6.28	2.99	2.20-4.07
5	102	713		7.04	5.17-9.59	4.16	2.95-5.87
6	191	750		12.54	9.49-16.56	8.02	5.89-10.93
N of ICD-9 procedures
0 (ref)	313	8627	<0.0001 a	1		1
1	164	2500		1.96	1.59-2.41	1.89	1.52-2.35
2	106	1321		2.37	1.86-3.02	1.87	1.43-2.44
3	110	636		5.41	4.25-6.87	4.10	3.16-5.34
4	57	321		5.43	4.06-7.56	4.08	2.92-5.68
5	54	169		10.06	7.23-14.0	6.59	4.55-9.55
6	65	148		13.82	10.07-18.98	7.97	5.61-11.33

^aχ² test; ^ball variables analyzed in the univariate analysis were included in the regression equation.

OR odds ratio, CI confidence interval. Bold indicates statistically significant results.