Table 3.
Comparison of the mechanical properties of respiratory measurement using IOS for men and women
| Parameters | Men (n = 180) | Women (n = 70) | ||||
|---|---|---|---|---|---|---|
| Non-OSA group (n = 83) | OSA group (n = 97) | p-Value | Non-OSA group (n = 35) | OSA group (n = 35) | p-Value | |
| Zrs5, (kPa/L/s) | 0.37 ± 0.11 | 0.45 ± 0.13 | <0.001 | 0.53 ± 0.14 | 0.61 ± 0.18 | 0.033 |
| R5, (kPa/L/s) | 0.35 ± 0.10 | 0.43 ± 0.12 | <0.001 | 0.50 ± 0.13 | 0.57 ± 0.15 | 0.041 |
| R10,(kPa/L/s) | 0.32 ± 0.09 | 0.38 ± 0.09 | <0.001 | 0.44 ± 0.11 | 0.47 ± 0.11 | 0.140 |
| R15,(kPa/L/s) | 0.30 ± 0.07 | 0.34 ± 0.08 | <0.001 | 0.40 ± 0.10 | 0.42 ± 0.09 | 0.242 |
| R20,(kPa/L/s) | 0.30 ± 0.07 | 0.35 ± 0.08 | <0.001 | 0.40 ± 0.09 | 0.42 ± 0.10 | 0.350 |
| R25,(kPa/L/s) | 0.30 ± 0.08 | 0.36 ± 0.09 | <0.001 | 0.41 ± 0.08 | 0.42 ± 0.09 | 0.434 |
| R35,(kPa/L/s) | 0.33 ± 0.07 | 0.39 ± 0.09 | <0.001 | 0.43 ± 0.08 | 0.45 ± 0.09 | 0.317 |
| Grs, (L/s/kPa) | 2.78 ± 0.64 | 2.26 ± 0.50 | <0.001 | 1.92 ± 0.45 | 1.61 ± 0.33 | 0.002 |
| sGrs, (s−1 · kPa−1) | 0.76 ± 0.19 | 0.68 ± 0.17 | 0.007 | 0.68 ± 0.17 | 0.63 ± 0.17 | 0.171 |
| Gz, (L/s/kPa) | 2.94 ± 0.75 | 2.40 ± 0.63 | <0.001 | 2.04 ± 0.55 | 1.76 ± 0.44 | 0.021 |
| sGz, (s−1 · kPa−1) | 0.80 ± 0.22 | 0.72 ± 0.19 | 0.031 | 0.72 ± 0.19 | 0.69 ± 0.21 | 0.363 |
| X5,(kPa/L/s) | −0.08 ± 0.05 | −0.13 ± 0.08 | <0.001 | −0.15 ± 0.07 | −0.22 ± 0.13 | 0.008 |
| X10,(kPa/L/s) | −0.03 ± 0.04 | −0.05 ± 0.06 | <0.001 | −0.07 ± 0.06 | −0.12 ± 0.09 | 0.030 |
| X15,(kPa/L/s) | 0.00 ± 0.04 | −0.02 ± 0.05 | <0.001 | −0.04 ± 0.06 | −0.08 ± 0.08 | 0.033 |
| X20,(kPa/L/s) | 0.03 ± 0.03 | 0.02 ± 0.04 | 0.002 | 0.03 ± 0.18 | −0.03 ± 0.06 | 0.029 |
| X25,(kPa/L/s) | 0.07 ± 0.03 | 0.06 ± 0.04 | 0.060 | 0.05 ± 0.04 | 0.02 ± 0.05 | 0.027 |
| X35,(kPa/L/s) | 0.12 ± 0.04 | 0.11 ± 0.04 | 0.646 | 0.09 ± 0.04 | 0.09 ± 0.04 | 0.911 |
| Fres,(Hz) | 14.4 ± 4.7 | 17.7 ± 6.0 | <0.001 | 19.4 ± 7.4 | 23.5 ± 9.3 | 0.081 |
Abbreviations: Zrs5 respiratory system impedance at 5Hz (oscillatory frequency), R5 ~ R35 respiratory system resistance at 5, 10, 15, 20, 25, 35 oscillatory frequencies, X5 ~ X35 respiratory system reactance at 5, 10, 15, 20, 25, 35Hz, Grs respiratory conductance, reciprocal of R0 (total respiratory resistance, namely the resistance origin at the point of zero frequency), sGrs the specific Grs (the ratio of Grs to actual value of FRC), Gz reciprocal of Zrs5, sGz the specific Gz (the ratio of Gz to actual value of FRC), Fres resonant frequency, integrated area of low-frequency reactance from zero line between X5 and resonant frequency; IOS parameters are expressed as mean ± SD. Comparison was made between the two group using Mann–Whitney-Wilcoxon test. A p-value below 0.05 was considered to exist significant difference