Characteristics of COPD patients and population controls by sex
| COPD | Control | ||||
| All | Mild | Moderate | Severe | ||
| Women | |||||
| No. | 23277 | 7939 | 13440 | 1898 | 23259 |
| Mean (SD) age at diagnosis | 66.7 (15.5) | 65.8 (18.6) | 66.9 (13.8) | 68.8 (11.9) | None |
| Total person-years | 67913 | 26924 | 38008 | 2981 | 107126 |
| Status in 1997 | |||||
| Alive | 11289 | 3291 | 7282 | 716 | 10082 |
| Dead | 5585 | 2104 | 2646 | 835 | 3356 |
| Lost to follow up | 6403 | 2544 | 3512 | 347 | 9821 |
| Men | |||||
| No. | 27437 | 10059 | 15155 | 2223 | 27429 |
| Mean (SD) age at diagnosis | 66.8 (14.6) | 65.9 (17.3) | 67.0 (12.9) | 69.2 (11.0) | None |
| Total person-years | 78113 | 33050 | 41921 | 3142 | 118196 |
| Status in 1997 | |||||
| Alive | 12084 | 3759 | 7588 | 737 | 10731 |
| Dead | 8341 | 3323 | 3824 | 1194 | 5658 |
| Lost to follow up | 7012 | 2977 | 3743 | 292 | 11040 |