Table 4.

Predictors of variable AFO versus persistent AFO^a

	Odds ratio (OR)b	95% confidence interval	p value
Age (per year)	1.007	(1.003, 1.011)	0.002
Gender
Male	0.725	(0.669, 0.787)	<0.001
Smoking status
Current smoker (reference)	1.000
Ex-smoker	1.082	(0.990, 1.183)	0.083
Never smoker	1.455	(1.048, 2.020)	0.025
Body mass index, kg/m2
≥18.5 and <25 (reference)	1.000
<18.5	0.739	(0.580, 0.941)	0.014
≥25 and <30	1.425	(1.291, 1.573)	<0.001
≥30 and <35	1.794	(1.594, 2.018)	<0.001
≥35	2.126	(1.830, 2.470)	<0.001
Number of diagnosed comorbidities (for each)	1.116	(1.089, 1.144)	<0.001

AFO airflow obstruction

^aUsing multivariable logistic regression where the outcome is the odds of variable AFO versus persistent AFO, and all values of predictor variables are as at baseline

^bEstimated for N = 10,105 subjects having values observed for all the variables shown in this table, all of which were used in this multivariable regression model