Predictors of exacerbation frequency in chronic obstructive pulmonary disease

Table 2 Logistic analysis of predictors for severely frequent exacerbations (Group 2B)

	B	Wald	Sig.	RR	95% CI for RR
	B	Wald	Sig.	RR	Lower	Upper
Comorbidity	1.340	5.453	0.020	3.818	1.240	11.752
NPPV	1.145	7.691	0.006	3.143	1.399	7.062
FEV₁	-0.954	5.096	0.024	0.385	0.168	0.882
Exacerbations in the year preceding enrollment	0.861	13.881	0.000	2.366	1.504	3.722

RR, relative risk; NPPV, non-invasive positive pressure ventilation; FEV₁, forced expiratory volume in one second.

ISSN: 2047-783X