Table 4.

Multivariable Poisson model for number of AECOPD events in the year before baseline assessment (n = 255)

Parameter	AIRR	95% confidence interval		p value	Variance inflation factor
		lower	upper
Sex (men vs. women)	0.89	0.63	1.27	0.430	1.32
Age, per 10 years	1.08	0.87	1.34	0.414	1.11
BMI, per 5 kg/m2	1.05	0.93	1.20	0.403	1.33
Current smokers versus nonsmoker	0.95	0.64	1.41	0.793	1.23
Heart rate, per 10 beats per minute	1.08	0.96	1.22	0.116	1.35
FEV1% predicted, per 10%	0.84	0.76	0.93	0.0002	1.51
CAT-score	1.02	0.99	1.06	0.058	1.84
SF-6D V1, per 0.1 units increase	0.89	0.77	1.02	0.077	1.73
Number of COPD medications	1.17	1.06	1.30	0.004	1.58
White blood cell count, per 1,000 cells/μL	0.99	0.93	1.05	0.605	1.50
Platelet count, per 10,000 platelets/μL	1.03	1.01	1.05	0.010	1.44
IgG2, per g/L	0.84	0.74	0.95	0.006	1.25

AECOPD, acute exacerbation of chronic obstructive pulmonary disease; COPD, chronic obstructive pulmonary disease; AIRR, adjusted incident rate ratio.