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Table 1 Anthropometric data and the respiratory function data of patients according to polysomnographic results

From: Receiver operating characteristics of impulse oscillometry parameters for predicting obstructive sleep apnea in preobese and obese snorers

  snorers[A] mild OSA[B] OSAS[C] p Value p Value p Value
(n = 84) (n = 37) (n = 93) [A] vs. [B] [A] vs. [C] [B] vs. [C]
Age, years 44.5 ± 8.4 45.6 ± 9.1 46.3 ± 10.9 1.000 0.708 1.000
Height, cm 166.7 ± 8.6 165.4 ± 8.3 167.2 ± 9.0 1.000 1.000 0.863
Weight, kg 79.9 ± 10.7 83.3 ± 14.1 88.4 ± 15.5 0.606 <0.001* 0.162
BMI, kg/m2 28.9 ± 3.3 30.4 ± 4.1 31.5 ± 4.3 0.150 <0.001* 0.393
Sex, male/female 57/27 23/14 72/21 0.160 0.160 0.160
FVC, L 3.81 ± 0.68 3.62 ± 0.67 3.77 ± 0.89 0.664 1.000 1.000
FEV1, L 3.08 ± 0.59 2.94 ± 0.55 3.05 ± 0.73 0.847 1.000 1.000
FEV1/FVC, % predicted 101 ± 6.0 103 ± 6.5 102 ± 6.2 0.394 0.858 1.000
TLC, L 5.70 ± 0.92 5.50 ± 0.87 5.68 ± 1.02 0.887 1.000 0.989
RV, L 2.02 ± 0.43 2.00 ± 0.37 2.06 ± 0.42 1.000 1.000 1.000
IC, L 2.29 ± 0.60 2.32 ± 0.61 2.51 ± 0.65 1.000 0.057 0.369
ERV, L 1.38 ± 0.54 1.17 ± 0.58 1.11 ± 0.54 0.171 0.004* 1.000
FRC, L 3.41 ± 0.67 3.17 ± 0.71 3.16 ± 0.71 0.267 0.062 1.000
Rrs0 seated, Pa · s · L−1 0.44 ± 0.13 0.49 ± 0.13 0.53 ± 0.16 0.234 <0.001* 0.340
Rrs0 supine, kPa · s · L−1 0.58 ± 0.12 0.68 ± 0.11 0.76 ± 0.18 0.004* <0.001* 0.025*
Grs seated, L · kPa−1 · s−1 2.46 ± 0.66 2.19 ± 0.60 2.03 ± 0.56 0.067 <0.001* 0.580
Grs supine, L · kPa−1 · s−1 1.78 ± 0.34 1.51 ± 0.28 1.40 ± 0.33 <0.001* <0.001* 0.195
RDI, events/h 2.60 ± 1.60 9.91 ± 3.78 41.75 ± 21.10 0.009* <0.001* <0.001*
  1. Abbreviations: BMI body mass index, FVC forced vital capacity, FEV 1 forced expiratory volume in 1 s, FEV 1 /FVC, (% predicted) ratio of FEV1 to FVC, (percentages of predicted values), ERV expiratory reserve volume, FRC functional residual capacity, RV residual volume, TLC total lung capacity, IC inspiratory capacity, Rrs0 resistance at zero-frequency, is derived from linear-regression analysis of resistance vs frequency (over the 5 to 15Hz) and calculated for each subject in every condition according to the linear model (Fig. 2), Grs respiratory conductance at 0 Hz, the reciprocal of Rrs0, RDI respiratory disturbance index. The data are expressed as means ± standard deviation. Comparisons were made between groups using one-way ANOVA. p-values < 0.05 were considered statistically significant
  2. * Exist significant difference [A] Snorers group [B] Mild OSA group [C] OSAS group