Table 1.
Participant characteristics
| Total N = 7439 | Reduced lung function N = 995 | No reduced lung function N = 6271 |
p value | |
|---|---|---|---|---|
| Age (mean) | 63.22 (40–84) | 63.73 (40–84) | 63.02 (40–84) | 0.048a |
| Sex | 0.505b | |||
| Women | 4065 (54.6%) | 532 (13.4%) | 3424 (86.6%) | |
| Men | 3374 (45.4%) | 463 (14.0%) | 2847 (86.0%) | |
| SpO2 (mean) | ||||
| Visit 1 | 97.8 (87–100) | 97.33 (87–100) | 97.89 (89–100) | < 0.001a |
| Visit 2 | 97.62 (84–100) | 97.22 (89–100) | 97.69 (90–100) | < 0.001a |
| Increased dyspnea at visit 2 | < 0.001b | |||
| Yes | 847 (11.4%) | 185 (22.9%) | 624 (77.1%) | |
| No | 6592 (88.6%) | 810 (12.5%) | 5647 (87.5%) | |
| Smoking | < 0.001c | |||
| Yes | 901 (12.1%) | 258 (29.4%) | 619 (70.6%) | |
| Previously | 3603 (48.4%) | 522 (14.9%) | 2988 (85.1%) | |
| Never | 2857 (38.4%) | 208 (7.4%) | 2596 (92.6%) | |
| mMRC ≥ 2 | < 0.001b | |||
| Yes | 376 (5.1%) | 121 (35.0%) | 225 (65.0%) | |
| No | 7047 (94.7%) | 873 (12.6%) | 6031 (87.4%) | |
| Self-reported disease: | ||||
| Asthma | < 0.001b | |||
| Yes | 823 (11.1%) | 241 (30.4%) | 551 (69.6%) | |
| No | 6353 (85.4%) | 710 (11.4%) | 5506 (88.6%) | |
| COPD | < 0.001b | |||
| Yes | 313 (4.2%) | 167 (56.6%) | 128 (43.4%) | |
| No | 6817 (91.6%) | 770 (11.5%) | 5901 (88.5%) | |
| Symptoms of airway infection the previous 7 days at visit 2: | < 0.001b | |||
| Yes | 1077 (14.5%) | 182 (17.4%) | 865 (82.6%) | |
| No | 6340 (85.2%) | 809 (13.1%) | 5388 (86.9%) | |
| Heart attack | 0.003b | |||
| Yes | 365 (4.9%) | 67 (18.9%) | 287 (81.1%) | |
| No | 6788 (91.2%) | 885 (13.3%) | 5747 (86.7%) | |
p values according to aindependent t-test, bχ2 and c χ2 for trend, as indicated