Table 2.

Multilevel logistic regression model* assessing the association between participant characteristics and likelihood of being listed on a chronic obstructive pulmonary disease (COPD) register among those with case-found COPD (n=754)

Participant characteristics	aOR†	(95% CI)	P value
Age	1.02	(0.99 to 1.05)	0.139
Sex (male)	1.01	(0.63 to 1.60)	0.976
Smoking status
Never smoked (reference)
Ex-smoker	6.32	(1.88 to 21.29)	0.003
Current smoker	8.68	(2.53 to 29.82)	0.001
FEV1 % predicted	0.96	(0.95 to 0.98)	<0.001
Self-reported comorbidities (n)	0.97	(0.78 to 1.20)	0.766
CAT score	1.02	(0.99 to 1.05)	0.218

*Using data from the main TargetCOPD trial dataset.

†aOR estimated by a multilevel logistic regression model, accounting for clustering by practice and adjusted for all variables listed in the table.

aOR, adjusted OR; CAT, COPD assessment test; FEV₁, forced expiratory volume in 1 s.