Effect of specific resistances on ventilatory function. All results are relative to zero resistance
| Percentage fall in ventilatory function (95% CI) | |||
|---|---|---|---|
| R =1.5 cm H2O/l/ s | R =2.5 cm H2O/l/s | R =3.5 cm H2O/l/s | |
| FVC | 1.5 (0.8 to 2.3) | 2.6 (1.4 to 3.8) | 3.6 (1.9 to 5.3) |
| FEV1 | 1.9 (1.0 to 2.8) | 3.1 (1.7 to 4.6) | 4.4 (2.4 to 6.4) |
| PEF | 6.9 (5.4 to 8.3) | 11.5 (9.1 to 13.9) | 16.0 (12.7 to 19.4) |
CI = confidence interval; R = breathing circuit resistance.