Table 1.
Participants’ characteristics by survey. Distributions are expressed as number (percentage), median [range] or mean ± standard deviation.
| ECRHS-2n = 2045 | ECRHS-3n = 1725 | |
|---|---|---|
| Age, years | 43.4 [28.0,56.8] | 53.7 [39.7,66.9] |
| Smoking habits | ||
| Non smokers | 928 (45.4%) | 774 (44.9%) |
| Past smokers with <15py | 387 (18.9%) | 472 (27.4%) |
| Past smokers with ≥15py | 119 (5.8%) | 155 (9.0%) |
| Current smokers with <15py | 249 (12.2%) | 102 (5.9%) |
| Current smokers with ≥15py | 272 (13.3%) | 132 (7.7%) |
| Smokers with unknown py | 86 (4.2%) | 89 (5.2%) |
| missing | 4 (0.2%) | 1 (0.1%) |
| Exposure to passive smoke in the last 12 months | ||
| No | 1275 (62.4%) | 1376 (79.8%) |
| Yes | 759 (37.1%) | 337 (19.5%) |
| missing | 11 (0.5%) | 12 (0.7%) |
| Body mass index, | ||
| <25 kg/m2 | 1194 (58.4%) | 736 42.7%) |
| [25–30) kg/m2 | 591 (28.9%) | 578 (33.5%) |
| ≥30 kg/m2 | 258 (12.6%) | 400 (23.2%) |
| missing | 2 (0.1%) | 11 (0.6%) |
| Age completed full time education | ||
| 16years or younger | 357 (17.5%) | 252 (14.6%) |
| 17–20 years | 653 (31.9%) | 614 (35.6%) |
| 21years or older | 1030 (50.4%) | 818 (47.4%) |
| missing | 5 (0.2%) | 41 (2.4%) |
| Vigorous physical activity | ||
| No | 1207 (59.0%) | 979 (56.8%) |
| Yes | 808 (39.5%) | 742 (43.0%) |
| missing | 30 (1.5%) | 4 (0.2%) |
| Menstrual Periods | ||
| Regular | 1199 (58.6%) | 464 (26.9%) |
| Never been regular | 120 (5.9%) | 72 (4.2%) |
| Recently irregular | 220 (10.8%) | 139 (8.1%) |
| Have stopped (>6 months) | 464 (22.7%) | 840 (48.7%) |
| missing | 42 (2.0%) | 210 (12.2%) |
| Use of corticosteroids in the last 12 months | ||
| No | 1824 (89.2%) | 1538 (89.2%) |
| Inhaled corticosteroids only | 150 (7.3%) | 68 (3.9%) |
| Oral corticosteroids | 38 (1.6%) | 20 (1.2%) |
| missing | 33 (1.6%) | 99 (5.7%) |
| FEV1, (mL) | 2959 ± 505 | 2574 ± 500 |
| FEV1,% of predicted | 98.7 ± 13.5 | 94.4 ± 14.9 |
| FVC, (mL) | 3675 ± 588 | 3392 ± 593 |
| FVC,% of predicted | 99.8 ± 12.6 | 99.0 ± 13.5 |
| FEV1/FVC ratio (%) | 80.6 ± 6.6 | 75.9 ± 6.5 |
| FEV1/FVC ratio,% of predicted | 98.5 ± 7.8 | 94.7 ± 7.9 |
| Airflow limitation (FEV1/FVC<LLN) | 129 (6.3%) | 174 (10.1%) |
| Restrictive pattern on spirometry (FVC<LLN and FEV1/FVC≥LLN) | 81 (4.2%) | 62 (4.0%) |