Table 2—

Logistic regression analyses with fast/slow tertile of decline in forced expiratory volume in 1 s (FEV₁) as the dependent variable^#

	Stepwise logistic regression		Adjusted logistic regression^¶
	OR (95% CI)	p-value⁺	OR (95% CI)	p-value⁺
SF-36 physical score	1.102 (1.030–1.180)	0.005	1.080 (1.004–1.161)	0.039
Exacerbation rate	2.760 (1.245–6.119)	0.012	2.725 (1.184–6.271)	0.018
BDR^§	4.316 (1.300–14.334)	0.017	3.997 (1.083–14.748)	0.038
BMI kg·m⁻²	0.818 (0.680–0.984)	0.033	0.775 (0.620–0.968)	0.025
Female sex			0.445 (0.108–1.839)	0.264
Age yrs			1.005 (0.925–1.091)	0.913
Smoking pack-yrs			1.002 (0.958–1.047)	0.935
FEV₁ % pred			1.016 (0.990–1.044)	0.232

Odds ratios (ORs) relate to the odds of being in the fast tertile. CI: confidence interval; SF-36: 36-item short-form health survey; BDR: bronchodilator reversibility; BMI: body mass index; % pred: % predicted. ^#: all of the variables listed in table 1⇑ were available for inclusion in the stepwise model, and the variables listed were forced into the adjusted model; ^¶: for sex, age, smoking and FEV₁; ⁺: significant values are shown in bold type; ^§: American Thoracic Society criteria.