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Table 1 Anthropometric, spirometric, lung volumes and nocturnal PSG data in the OSA group and non-OSA group 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

Variables Men (n = 193) Women (n = 70)
Non-OSA group (n = 87) OSA group (n = 106) p-Value Non-OSA group (n = 35) OSA group (n = 35) p-Value
Age, years 44 ± 8 45 ± 10 0.605 47 ± 9 50 ± 9 0.091
Height, cm 172 ± 5.5 171 ± 6.3 0.269 158 ± 5.1 157 ± 6.0 0.266
Weight, kg 82 ± 10.4 90 ± 14.8 <0.001 74 ± 12.3 75 ± 13.5 0.698
BMI, kg/m2 28.0 ± 3.0 30.5 ± 4.2 <0.001 29.7 ± 4.9 30.7 ± 5.1 0.388
FVC, L 4.19 ± 0.50 4.06 ± 0.62 0.117 3.07 ± 0.49 2.83 ± 0.61 0.075
FEV1, L 3.36 ± 0.44 3.28 ± 0.53 0.188 2.47 ± 0.42 2.31 ± 0.47 0.125
FEV1/FVC, (% pred) 100 ± 6.0 101 ± 6.4 0.285 101 ± 7.4 103 ± 6.9 0.231
PEF, L/s 8.36 ± 1.33 8.12 ± 1.60 0.266 6.02 ± 1.10 5.78 ± 0.97 0.350
MEF75, L/s 7.16 ± 1.38 6.86 ± 1.40 0.132 5.39 ± 1.27 5.31 ± 1.15 0.785
MEF50, L/s 4.02 ± 0.96 3.80 ± 1.13 0.158 3.29 ± 1.13 3.04 ± 0.84 0.300
MEF25, L/s 1.43 ± 0.52 1.35 ± 0.56 0.138 1.12 ± 0.61 0.98 ± 0.40 0.275
MEF25–75, L/s 3.30 ± 0.87 3.13 ± 0.98 0.325 2.59 ± 0.97 2.40 ± 0.71 0.355
ERV, L 1.56 ± 0.55 1.26 ± 0.53 <0.001 1.09 ± 0.53 0.83 ± 0.40 0.022
FRC, L 3.73 ± 0.57 3.40 ± 0.62 <0.001 2.87 ± 0.57 2.60 ± 0.47 0.037
TLC, L 6.24 ± 0.61 6.08 ± 0.74 0.103 4.70 ± 0.48 4.50 ± 0.62 0.140
RV, L 2.17 ± 0.38 2.15 ± 0.41 0.740 1.78 ± 0.32 1.77 ± 0.32 0.953
IC, L 2.51 ± 0.55 2.68 ± 0.56 0.041 1.83 ± 0.39 1.90 ± 0.45 0.494
VC, L 4.07 ± 0.56 3.93 ± 0.64 0.124 2.92 ± 0.45 2.73 ± 0.53 0.102
ERV/TLC, % 25.0 ± 8.2 20.5 ± 7.8 <0.001 23.0 ± 9.4 18.4 ± 8.4 0.035
FRC/TLC, % 59.8 ± 7.5 55.9 ± 7.4 <0.001 61.0 ± 8.0 57.2 ± 7.8 0.046
RV/TLC, % 34.8 ± 5.6 35.5 ± 5.8 0.425 37.9 ± 6.3 39.5 ± 6.6 0.275
I C/TLC, % 40.2 ± 7.5 44.0 ± 7.6 0.001 39.1 ± 7.9 42.1 ± 8.0 0.121
VC/TLC, % 65.6 ± 5.6 64.6 ± 5.7 0.501 62.2 ± 6.3 60.5 ± 6.6 0.274
AI, events/h 0.2(0–4.4) 20.0(0–101.7) <0.001† 0(0–2.7) 2.6(0–57.6) <0.001†
HI, events/h 2.4(0–9.2) 9.7(0.1–40.9) <0.001† 2.7(0–6.5) 20.0(2.8–86) <0.001†
AHI, events/h 3.6(0–10) 30.8(10.4–102.1) <0.001† 3.2(0–6.5) 23.6(5.4–86.2) <0.001†
  1. Abbreviations: BMI body mass index, FVC forced vital capacity, FEV 1 forced expiratory volume in 1 s, FEV 1 /FVC(%, pred) ratio of FEV1 to FVC (ratio of the value to the predicted FEV1/FVC), PEF peak expiratory flow, MEF 75,50,25 maximal expiratory flow at 75 %, 50 %, and 25 % of FVC, ERV expiratory reserve volume, FRC functional residual capacity, RV residual volume, TLC total lung capacity, IC inspiratory capacity, VC vital capacity, ERV/TLC ratio of ERV to TLC, AI apnea index, HI hypopnea index, AHI apnea + hypopnea index. Normally distributed data are expressed as mean ± SD; AI, HI and AHI are expressed as median (range). Comparison was made between the groups using the Independent-Samples t-test or t’-test, when data for variables showed a normal distribution and homogeneity or inhomogeneity of variances, otherwise, Wilcoxon test was used. A p-value below 0.05 was considered to be significant. † represents Mann–Whitney-Wilcoxon test