Table 3.

Adjusted association between year and 30-day readmission related to chronic obstructive pulmonary disease by timing of readmission

Year	COPD-related Readmission				COPD-related Early Readmission (0–7 d)				COPD-related Late Readmission (8–30 d)
	Adjusted Odds Ratio	95% CI		P Value	Adjusted Odds Ratio	95% CI		P Value	Adjusted Odds Ratio	95% CI		P Value
		Lower	Upper			Lower	Upper			Lower	Upper
2006–2012	1 (Reference)				1 (Reference)				1 (Reference)
2013	0.91	0.88	0.94	<0.001	0.88	0.84	0.93	<0.001	0.93	0.90	0.97	<0.001
2014	0.90	0.87	0.92	<0.001	0.81	0.77	0.86	<0.001	0.94	0.91	0.98	0.002
2015	0.84	0.81	0.86	<0.001	0.80	0.75	0.84	<0.001	0.86	0.83	0.90	<0.001

Definition of abbreviations: COPD = chronic obstructive pulmonary disease, CI = confidence interval.