Table 3 Vital status and crude and age‐adjusted death rate, by FEV1 rate of decline categories, US, National Study of Coal Workers' Pneumoconiosis, 1969–97.
| FEV1 rate of decline category (ml/year) | ||||
|---|---|---|---|---|
| <30 | 30 to <60 | 60 to <90 | ⩾90 | |
| (A) Death from all‐cause (n = 1730) | ||||
| n = 580 | n = 688 | n = 300 | n = 162 | |
| Dead (n, %) | 78 (3.4) | 99 (14.3) | 61 (20.4) | 47 (29.0) |
| Crude mortality rate per 1000 person‐years | 11.0 (8.5 to 13.4) | 11.8 (9.5 to 14.2) | 15.5 (11.6 to 19.3) | 22.6 (16.1 to 29.0) |
| Age adjusted mortality rate per 1000 person‐years | 11.4 (11.3 to 11.5) | 11.8 (11.7 to 11.8) | 13.2 (13.0 to 13.3) | 24.0 (23.8 to 24.3) |
| (B) Death from cardiovascular disease and non‐malignant respiratory disease (n = 1584) | ||||
| n = 542 | n = 631 | n = 266 | n = 145 | |
| Dead (n, %) | 40 (7.3) | 42 (5.3) | 27 (7.3) | 30 (15.2) |
| Crude mortality rate per 1000 person‐years | 5.8 (4.0 to 7.6) | 5.3 (3.7 to 6.9) | 7.3 (4.6 to 10.1) | 15.2 (9.8 to 20.6) |
| Age adjusted mortality rate per 1000 person‐years | 6.1 (6.0 to 6.1) | 5.2 (5.2 to 5.3) | 5.5 (5.4 to 5.5) | 16.1 (15.9 to 16.3) |
FEV1, forced expiratory volume in one second.