Predicted and lower limit of normal(LLN) lung function equations for males and females from the European Community Respiratory Health Survey data
| Males | |
| Predicted equation | |
| FEV1 | 4.976Ht – 0.020A – 3.695 |
| FVC | 6.957Ht – 0.010A – 6.610 |
| FEV1/FVC | 89.602 – 0.185A |
| LLN equation | |
| FEV1 | 4.976Ht – 0.020A – 4.526 |
| FVC | 6.957Ht – 0.010A – 7.602 |
| FEV1/FVC | 79.401 – 0.185A |
| Females | |
| Predicted equation | |
| FEV1 | 3.872Ht – 0.019A – 2.412 |
| FVC | 5.251Ht – 0.009A – 4.425 |
| FEV1/FVC | 94.644 – 0.287A |
| LLN equation | |
| FEV1 | 3.872Ht – 0.019A – 3.021 |
| FVC | 5.251Ht – 0.009A – 5.182 |
| FEV1/FVC | 85.101 – 0.287A |
FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity; Ht: height (in metres); A: age (in years).