Table 2.

Analysis of potential factors affecting unplanned COPD^ patient readmission episodes

	Univariate Analysis			Multivariate Analysis (Logistic Regression)
	Unplanned Readmission			Unplanned Readmission
	Yes (n = 15882) Mean ± SD	No (n = 49615) Mean ± SD	P	OR(95% CI)	P
Age (yrs)	76.74 ± 9.34	76.83 ± 9.67	0.020	1.00(0.996-1.000)	0.049
Gender
Male	12889 (81.2)	37567 (75.7)	< 0.001	1.45 (1.38-1.52)	< 0.001
Female	2993 (18.8)	12048 (24.3)		1.00 (reference)
Public assistance*
Yes	8235 (51.9)	20458 (41.2)	< 0.001	1.41(1.36-1.46)	< 0.001
No	7647 (48.1)	29157 (58.8)		1.00 (reference)
Living in nursing home
Yes	3820 (24.1)	8756 (17.6)	< 0.001	1.41 (1.34-1.47)	< 0.001
No	12062 (75.9)	40859 (82.4)		1.00 (reference)
Charlson comorbidity index	1.20 ± 0.82	1.21 ± 0.72	0.053	0.99(0.96-1.01)	0.233

^ COPD: ICD-9-CM Diagnosis Code: 490-492, 494-496

*Public assistance: Patients eligible for complete or partial medical fee waiver