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Table 3 Comparison of the mechanical properties of respiratory measurement using IOS for men and women

From: Impact of obstructive sleep apnea on lung volumes and mechanical properties of the respiratory system in overweight and obese individuals

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
  1. 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