Quintiles of cardiorespiratory function for men and women (the Aerobics Center Longitudinal Study, 1971–1995)
| Quintile | MTT (min) | FEV1 (litres) | FVC (litres) | FEV1/FVC (%) |
|---|---|---|---|---|
| MTT, Maximal treadmill test; FEV1, forced expiratory volume in the first second; FVC, forced vital capacity. | ||||
| Men | ||||
| Q1 | <14.5 | <3.4 | <4.4 | <73.0 |
| Q2 | 14.5–16.9 | 3.4–3.7 | 4.4–4.7 | 73.0–76.9 |
| Q3 | 17.0–19.4 | 3.8–4.0 | 4.8–5.1 | 77.0–79.9 |
| Q4 | 19.5–22.1 | 4.1–4.4 | 5.2–5.5 | 80.0–83.9 |
| Q5 | >22.1 | >4.4 | >5.5 | >83.9 |
| Women | ||||
| Q1 | <10.0 | <2.4 | <3.1 | <75.0 |
| Q2 | 10.0–12.1 | 2.4–2.6 | 3.1–3.3 | 75.0–78.9 |
| Q3 | 12.2–14.6 | 2.7–2.8 | 3.4–3.5 | 79.0–81.9 |
| Q4 | 14.7–16.9 | 2.9–3.1 | 3.6–3.8 | 82.0–84.9 |
| Q5 | >16.9 | >3.1 | >3.8 | >84.9 |