TABLE 2.
Characteristics of the different lung function impairment groups in the SCAPIS Main cohort
| Normal spirometry, n=4084 | Moderate–severe CAL, n=170 | Mild CAL, n=278 | PRISm, n=238 | RSP, n=238 | |
|---|---|---|---|---|---|
| Definition | FEV1/FVC≥LLN FEV1≥LLN FVC≥LLN | FEV1/FVC<LLN FEV1<LLN | FEV1/FVC<LLN FEV1≥LLN | FEV1/FVC≥LLN FEV1<LLN | FEV1/FVC≥LLN FVC<LLN |
| Age, years | 57.6±4.3 | 58.1±4.3 | 57.4±4.4 | 57.8±4.3 | 57.6±4.3 |
| BMI, kg·m−2 | 26.7±4.1 | 27.4±5.1 | 25.9±3.8 | 29.0±5.5 | 28.6±5.5 |
| Female | 2074 (50.8) | 77 (45.3) | 156 (56.1) | 114 (47.9) | 110 (46.2) |
| Smoking | |||||
| Never | 2112 (51.7) | 40 (23.5) | 95 (34.2) | 112 (47.1) | 126 (52.9) |
| Former | 1491 (36.5) | 68 (40.0) | 108 (38.8) | 78 (32.8) | 72 (30.3) |
| Present | 421 (10.3) | 61 (35.9) | 73 (26.3) | 45 (18.9) | 37 (15.5) |
| Unknown | 60 (1.5) | 1 (0.6) | 2 (0.7) | 3 (1.2) | 3 (1.3) |
| Pack-years | 0.0 (0.0–10.8) | 17.5 (0.3–36) | 6 (0.0–21.1) | 0.6 (0.0–18.8) | 0.0 (0.0–13.8) |
| Physical activity | |||||
| Low | 419 (10.5) | 40 (24.4) | 36 (13.1) | 45 (19.6) | 46 (19.9) |
| Medium | 3111 (77.7) | 119 (72.6) | 216 (78.8) | 172 (74.7) | 172 (74.1) |
| High | 473 (11.8) | 5 (3.0) | 22 (8.0) | 13 (5.7) | 14 (6.0) |
| Study centre | |||||
| Gothenburg | 687 (16.8) | 42 (24.7) | 52 (18.7) | 51 (21.4) | 49 (20.6) |
| Malmö | 597 (14.6) | 26 (15.3) | 19 (6.8) | 48 (20.2) | 48 (20.2) |
| Linköping | 695 (17.0) | 26 (15.3) | 63 (22.7) | 26 (10.9) | 28 (11.8) |
| Stockholm | 703 (17.2) | 22 (12.9) | 62 (22.3) | 45 (18.9) | 39 (16.4) |
| Uppsala | 710 (17.5) | 35 (20.6) | 49 (17.6) | 36 (15.2) | 40 (16.8) |
| Umeå | 692 (16.9) | 19 (11.2) | 33 (11.9) | 32 (13.4) | 34 (14.2) |
| Post-bronchodilator spirometry | |||||
| FEV1 (% pred) | 101.9 (10.7) | 70.7 (8.2) | 91.9 (8.3) | 75.0 (5.0) | 76.6 (6.6) |
| FVC (% pred) | 101.4 (10.6) | 89.2 (10.4) | 108.4 (9.7) | 76.6 (6.8) | 74.8 (5.3) |
| FEV1/FVC (% pred) | 100.2 (5.5) | 79.2 (7.8) | 84.4 (3.8) | 97.9 (6.3) | 102.0 (6.6) |
Data are presented as mean±sd, n (%) or median (interquartile range). CAL: chronic airflow limitation; PRISm: preserved ratio, impaired spirometry; RSP: restrictive spirometric pattern; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; LLN: lower limit of normal; BMI: body mass index.