Table 1.
Baseline Characteristics of Canadian Cohort Obstructive Lung Disease Study Participants*
| Characteristic | Total (N = 1452) | COPD (n = 691; 47.6%) | Non-COPD (n = 761; 52.4%) |
|---|---|---|---|
| Sociodemographic factor | |||
| Sex, n (%) | |||
| Male | 815 (56.1) | 412 (59.6) | 403 (53.0) |
| Female | 637 (43.9) | 279 (40.4) | 358 (47.0) |
| Age, mean (SD), yr | 66.6 (9.8) | 67.3 (10.1) | 66.0 (9.5) |
| BMI, mean (SD), kg/m2 | 27.7 (5.3) | 27.5 (5.31) | 27.8 (5.24) |
| Education, n (%) | |||
| No postsecondary | 328 (22.6) | 179 (25.9) | 149 (19.6) |
| Some postsecondary | 1124 (77.4) | 512 (74.1) | 612 (80.4) |
| Tobacco and biomass smoke exposure | |||
| Tobacco status, n (%) | |||
| Never smoker | 514 (35.4) | 192 (27.8) | 322 (42.3) |
| Ex-smoker | 718 (49.4) | 370 (53.5) | 348 (45.7) |
| Current smoker | 220 (15.2) | 129 (18.7) | 91 (12.0) |
| Pack-years smoking, mean (SD) | 26.1 (23.8) | 31.6 (24.3) | 19.8 (21.6) |
| Environmental tobacco smoke, n (%) | |||
| Never | 836 (57.6) | 370 (53.5) | 466 (61.2) |
| Ever | 616 (42.4) | 321 (46.5) | 295 (38.8) |
| Lifetime biomass exposure, n (%), yr | |||
| <10 | 1249 (86.0) | 596 (86.3) | 653 (85.8) |
| ⩾10 | 203 (14.0) | 95 (13.7) | 108 (14.2) |
| Respiratory health | |||
| FEV1, L | 2.55 (0.81) | 2.33 (0.78) | 2.76 (0.77) |
| FEV1 (% predicted) | 91.7 (20.2) | 82.3 (19.3) | 100 (17.1) |
| FVC, L | 3.68 (1.07) | 3.78 (1.11) | 3.59 (1.02) |
| FVC (% predicted) | 99.0 (17.2) | 100 (17.9) | 97.8 (16.4) |
| FEV1/FVC (%) | 69.5 (10.3) | 61.1 (8.14) | 77.1 (4.63) |
| Airflow limitation severity, n (%) | |||
| Mild (GOLD 1) | — | 388 (56.2) | N/A |
| Moderate (GOLD 2) | — | 264 (38.2) | N/A |
| Severe (GOLD 3) | — | 38 (5.5) | N/A |
| Very severe (GOLD 4) | — | 1 (0.1) | N/A |
| Respiratory medication, n (%) | |||
| None | 1124 (77.4) | 446 (64.5) | 678 (89.1) |
| ⩾1 | 328 (22.6) | 245 (35.5) | 83 (10.9) |
| Asthma, n (%) | |||
| Nonasthmatic | 1107 (76.2) | 470 (68.0) | 637 (83.7) |
| Asthmatic | 345 (23.8) | 221 (32.0) | 124 (16.3) |
| Childhood hospitalization for respiratory illness, n (%) | |||
| No | 1352 (93.2) | 630 (91.3) | 722 (94.9) |
| Yes | 99 (6.8) | 60 (8.7) | 39 (5.1) |
| Missing | 1 | 1 | 0 |
| Dysanapsis | |||
| Airway-to-lung ratio | |||
| Fourth quartile (highest) | 296 (24.3) | 87 (14.6) | 209 (33.5) |
| Third quartile | 305 (25.0) | 117 (19.6) | 188 (30.2) |
| Second quartile | 305 (25.0) | 165 (27.7) | 140 (22.5) |
| First quartile (lowest) | 313 (25.7) | 227 (38.1) | 86 (13.8) |
| Missing | 233 | 95 | 138 |
Definition of abbreviations: BMI = body mass index; COPD = chronic obstructive pulmonary disease; GOLD = Global Initiative for Chronic Obstructive Lung Disease; N/A = not applicable.
*
For 1,452 participants with complete data for baseline age, BMI, education, tobacco status, pack-years smoking, environmental tobacco smoke at home, biomass fuel exposure, respiratory medication intake, spirometry, and ambient nitrogen dioxide exposure.