Pre-bronchodilator impulse oscillometry (IOS) values at age 45 years
| Women | Men | |||
| Participants (n) | Mean (95% CI) | Participants (n) | Mean (95% CI) | |
| R5 (cmH2O·L·s−1) | 441 | 5.17 (5.00–5.35) | 454 | 4.49 (4.34–4.64) |
| R20 (cmH2O·L·s−1) | 441 | 4.15 (4.01–4.28) | 454 | 3.65 (3.54–3.77) |
| R5–R20 (cmH2O·L·s−1) | 441 | 1.03 (0.94–1.13) | 454 | 0.84 (0.76–0.84) |
| X5 (cmH2O·L·s−1) | 440 | −1.60 (−1.69– −1.50) | 454 | −1.19 (−1.26– −1.12) |
| AX (cmH2O·L·s−1) | 437 | 6.99 (6.32–7.67) | 449 | 4.86 (4.35–5.37) |
| fres (Hz) | 440 | 14.29 (13.81–14.77) | 452 | 13.06 (12.61–13.51) |
Means are geometric means of raw IOS values. The n values differ slightly because of missing data. R5: resistance at 5 Hz; R20: resistance at 20 Hz; R5−R20: difference between R5 and R20; X5: reactance at 5 Hz; AX: area under the reactance curve between 5 Hz and resonant frequency (fres).