TABLE 1

Characteristics of participants with or without obstructive lung disease (OLD)

	OLD	No OLD	p-value
Subjects n	184	726
Characteristics
Age years	61.3±14.3	57.1±15.2	<0.001
Male sex	62.3%	48.0%	<0.001
BMI	29.2±6.9	30.6±6.8	<0.001
Pre-bronchodilator spirometry
FEV₁ L	2.26±0.77	2.87±0.81	<0.001
FEV₁ % pred	75.1±15.6	95.8±15.3	<0.001
FEV₁/FVC ratio	0.63±0.09	0.77±0.06	<0.001
Post-bronchodilator spirometry
FEV₁ L	2.51±0.83	2.94±0.83	<0.001
FEV₁ % pred	82.8±17.7	98.0±16.2	<0.001
FEV₁/FVC ratio	0.66±0.11	0.79±0.06	<0.001
Change in FEV₁ post-bronchodilator	11.6±10.1%	2.9±4.1%	<0.001
SGRQ total score	40.5±18.5	37.0±17.3	<0.001
Diagnostic questionnaires
ASQ score	8.5±3.6	8.7±3.6	0.130
COPD-DQ score^#	23.4±5.2	20.8±5.3	<0.001
Symptom assessment
CAT total score	18.2±6.9	16.7±7.0	<0.001
Smoking status %
Lifetime nonsmokers	24.5%	43.4%	<0.001
Previous smokers	40.8%	37.2%
Current smokers	34.8%	19.4%
Smoking history
Total pack-years in previous and current smokers	31.4±24.3	19.8±18.5	<0.001

Data are presented as mean±sd, unless otherwise stated. BMI: body mass index; FEV₁: forced expiratory volume in 1 s; % pred: % predicted; FVC: forced vital capacity; SGRQ: St George's Respiratory Questionnaire; ASQ: Asthma Screening Questionnaire; COPD-DQ: COPD-Diagnostic Questionnaire; CAT: COPD Assessment Test. ^#: 499 subjects completed this questionnaire (116 with OLD and 383 without OLD).