Table 3.
Impulse oscillometry parameters for different asthma status
| Parameters | Asthma status | |||
|---|---|---|---|---|
| Uncontrolled | Partially controlled | Controlled | P-value | |
| Z5 | 6.3 (2.9) | 5.7 (2) | 4.4 (1.5) | 0.000 |
| R5 | 5.6 (2.2) | 5.2 (1.7) | 4.2 (1.2) | 0.000 |
| R20 | 3.7 (1) | 3.7 (0.84) | 3.3 (0.8) | 0.014 |
| R10 | 4.5 (1.5) | 4.5 (1.1) | 3.7 (0.9) | 0.000 |
| R5–R20 | 1.9 (1.4) | 1.5 (1.2) | 0.9 (0.7) | 0.000 |
| X5 | −5.3 (17.9) | 9.6 (79.3) | −1.5 (0.8) | 0.000 |
| Rc | 2.6 (0.8) | 2.8 (0.8) | 2.3 (0.9) | 0.031 |
| Rp | 5 (3.6) | 4.3 (2.3) | 2.9 (1.6) | 0.001 |
| Fres | 23.3 (7.7) | 21.5 (5.7) | 17.7 (5.5) | 0.000 |
| XA | 24.8 (22) | 18.2 (16.6) | 9.5 (8.9) | 0.000 |
| Z5% | 180 (68) | 163 (50) | 135 (37) | 0.001 |
| R5% | 164 (56) | 148 (39) | 127 (33) | 0.001 |
| R20% | 128 (33) | 126 (26) | 118 (28) | 0.16 |
| R10% | 141 (42) | 131 (36) | 121 (28) | 0.045 |
| R5–R20% | 36 (36) | 21 (30) | 9.4 (21) | 0.000 |
| X5% | 56 (1815) | 361 (844) | 600 (3702) | 0.032 |
Notes: Data are presented as mean (SD). Parameter units: cmsH2O/L· s–1. Fres: 1/s. Abbreviations: Z5, impedance; R5, resistance at 5 Hz; R20, resistance at 20 Hz; R10, resistance at 10 Hz; R5-R20, difference between R5 and R20; X5, reactance at 5 Hz; Rc, central resistance; Rp, peripheral resistance; Fres, resonance frequency; XA, reactance area.