Rate ratio of breathlessness comparing women to men, crude and adjusted for relative forced expiratory volume in 1 s (FEV1) (% predicted) in a cross-sectional study of 1000 randomly selected women and 1000 randomly selected men
| Subjects | Breathless subjects | Rate of breathlessness | Crude rate ratio | Adjusted# rate ratio | |
| All subjects (crude) | |||||
| Women | 1000 | 300 | 30% | 2.0 | |
| Men | 1000 | 150 | 15% | 1.0 (ref.) | |
| Low relative FEV1 | |||||
| Women | 500 | 180 | 36% | 2.0 | |
| Men | 500 | 90 | 18% | 1.0 (ref.) | |
| High relative FEV1 | |||||
| Women | 500 | 120 | 24% | 2.0 | |
| Men | 500 | 60 | 12% | 1.0 (ref.) | |
| All subjects (adjusted) | |||||
| Women | 1000 | 2.0 | |||
| Men | 1000 | 1.0 (ref.) |
#: for relative FEV1 (low and high).