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Table 6 Correlation between FRC and reactance at all frequencies derived from stepwise regression analysis in males and females

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

Model Explanatory variable Standardized coefficients t p Partial correlation Co-linearity statistics
Included variables Beta Male Beta Female Male Female Male Female Male Female Tolerance Male Tolerance Female
1 (Constant)    46.575 25.286 <0.001 <0.001     
  X5 0.320 0.326 4.501 2.842 <0.001 0.006 0.320 0.326 1.000 1.000
  Excluded variables
A X10 0.106 0.090 0.907 0.343 0.366 0.732 0.068 0.042 0.366 0.193
  X15 0.107 0.081 1.091 0.394 0.277 0.695 0.082 0.048 0.523 0.314
  X20 0.160 0.001 1.846 0.010 0.067 0.992 0.137 0.001 0.663 0.870
  X25 0.023 −0.089 0.290 −0.596 0.772 0.553 0.022 −0.073 0.784 0.597
  X35 0.005 −0.061 0.070 −0.478 0.945 0.634 0.005 −0.058 0.865 0.817
  AHI −0.133 −0.121 −1.745 −1.025 0.083 0.309 −0.130 −0.124 0.853 0.937
  BMI −0.111 −0.103 −1.351 −0.784 0.178 0.436 −0.101 −0.095 0.747 0.767
  1. Dependent variable: functional residual capacity (FRC). Independent variables: respiratory reactance at 5, 10, 15, 20, 25, 35 Hz (X5 ~ X35), apnea + hypopnea index (AHI) and body mass index (BMI). Variables showed in Model A were excluded variables and was derived from the regression analysis