Parameters | Asthmatic group | Probable asthmatic group | Control group | p-value |
Baseline | ||||
FEV1 % pred | 83.87 (78.85–87.67) | 96.37 (91.34–101.39) | 96.44 (93.83–98.60) | <0.0001 |
FVC % pred | 91.31 (85.84–96.78) | 97.64 (89.87–105.40) | 101.31 (96.77–105.84) | 0.02 |
Z5 % | 165.75 (146.75–184.76) | 134.93 (114.41–155.43) | 135.47 (122.99–147.95) | 0.01 |
R5 % | 158.55 (141.20–175.89) | 129.68 (109.05–150.32) | 131.61 (117.14–146.09) | 0.02 |
R20 % | 127.71 (113.79–141.63) | 124.50 (105.94–143.06) | 127.70 (116.09–139.30) | 0.99 |
Fres | 19.40 (17.41–21.40) | 16.93 (15.19–18.67) | 16.64 (15.39–17.89) | 0.03 |
Post-bronchodilator | ||||
FEV1 % pred | 89.88 (85.66–94.10) | 86.86 (77.05–84.37) | 89.44 (84.37–94.50) | ns |
FVC % pred | 96.22 (92.59–99.86) | 90.41 (78.74–102.09) | 90.88 (80.81–100.95) | ns |
Z5 % | 135.50 (119.44–151.57) | 113.95 (81.00–146.90) | 122.58 (95.45–149.71) | ns |
R5 % | 128.36 (113.41–143.31) | 110.45 (79.40–141.51) | 117.24 (88.13–146.35) | ns |
R20 % | 112.80 (99.27–126.34) | 102.20 (74.44–129.95) | 117.34 (85.97–148.70) | ns |
Fres | 17.38 (15.46–19.29) | 15.52 (11.77–19.28) | 14.00 (12.47–15.52) | ns |
Data are presented as lung function parameters % predicted (% pred) mean (95% confidence). FEV1: forced expiratory volume in one second; FVC: forced vital capacity; Z5: impedance at 5 HZ; R5: resistance at 5 HZ; Fres: resonant frequency; ns: not significant