Lung function by age group among tobacco and cannabis users
| Age band, years | Tobacco-only users | Tobacco and cannabis users | P-value a | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n | FEV1 Mean (SD) | FVC Mean (SD) | FEV1/FVC <0.7 % (95% CI) | n | FEV1 Mean (SD) | FVC Mean (SD) | FEV1/FVC<0.7 % (95% CI) | ||
| 15–24 | 11 | 107.1 (12.3) | 109.4 (16.8) | 9.1 (1.6 to 37.7) | 12 | 104.6 (9.7) | 112.2 (11.0) | 8.3 (1.5 to 35.4) | 0.95 |
| 25–34 | 34 | 96.2 (12.4) | 103.7 (15.8) | 5.9 (1.6 to 19.1) | 79 | 98.6 (14.2) | 107.3 (15.3) | 13.9 (8.0 to 23.2) | 0.36 |
| 35–44 | 64 | 96.1 (15.1) | 109.2 (15.6) | 15.6 (8.7 to 26.4) | 89 | 95.8 (15.7) | 109.3 (17.1) | 29.2 (20.8 to 39.4) | 0.08 |
| 45–54 | 68 | 92.6 (21.3) | 107.5 (16.5) | 27.9 (18.7 to 39.6) | 41 | 93.4 (17.0) | 108.1 (14.0) | 36.6 (23.6 to 51.9) | 0.46 |
| 55–64 | 28 | 89.1 (17.7) | 106.0 (23.3) | 53.5 (35.8 to 70.5) | 9 | 83.3 (41.1) | 113.8 (19.6) | 55.6 (26.7 to 81.1) | 0.78 |
| 65–74 | 5 | 72.0 (22.1) | 96.5 (20.6) | 80.0 (37.6 to 96.4) | 0 | – | – | – | – |
| All ages | 210 | 93.8 (18.1) | 107.0 (17.4) | 24.3 (19.0 to 30.5) | 230 | 96.4 (17.0) | 108.7 (15.8) | 25.2 (20.0 to 31.2) | 0.90 |
Figures for FEV1 and FVC are percentages of the predicted values from the reference equations by age and sex.
↵a P-value for difference in FEV1/FVC% tobacco only users compared with tobacco and cannabis users. FVC = forced vital capacity. FEV1 = forced expiratory volume in 1 second.