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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

From: Trends in hospital admissions at a Department for Infectious Diseases in Italy from 1995 to 2011 and implications for health policies

  Hospital stay over threshold (HSOT) Hospital stay in threshold p value Crude OR (95%CI) AdjustedbOR (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
  1. aχ2 test; ball variables analyzed in the univariate analysis were included in the regression equation.
  2. OR odds ratio, CI confidence interval. Bold indicates statistically significant results.