Table 3.

Correlations of Baseline Characteristics with Percentage of Period Hospitalized

		β	95% CI		P–Value
			Lower	Upper
Sex		−0.095	−0.219	0.030	0.14
Age, years		0.003	−0.003	0.009	0.33
FEV1 % predicted		−0.007	−0.01	−0.003	0.00*
Smoking status	Ex-smoker	0.021	−0.274	0.316	0.89
	Current smoker	−0.092	−0.394	0.209	0.55
	Unknown	−0.266	−0.624	0.093	0.15
Inhaled corticosteroids		−0.038	−0.170	0.095	0.58
Oxygen supplementation at home		0.315	0.153	0.477	0.00*
Prednisolone maintenance treatment		0.246	0.067	0.426	0.01*
Antibiotic maintenance treatment		0.241	0.045	0.438	0.02*
Number of COPD exacerbations in prior year		0.084	0.039	0.129	0.00*
Number of hospital admissions due to COPD exacerbation in prior year		0.191	0.128	0.253	0.00*

Notes: *P<0.05. β is the standardized regression coefficient