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Table 4 Differences and correlation coefficients between contraction period measured with diaphragmatic length (DL) and contraction period measured with thoracic motion (TM), respiratory airflow (FL) and transdiaphragmatic pressure (DP), for all the respiratory cycles analysed.

From: Non-Invasive monitoring of diaphragmatic timing by means of surface contact sensors: An experimental study in dogs

  r R p ρ MEAN(s) SD(s) MEAN - 2SD (s) MEAN + 2SD (s)
DL vs TM 1 0.98 0.95 1.01 0.98 0.055 0.050 -0.045 0. 156
DL vs FL 1 0.94 0.93 0.86 0.91 -0.021 0.080 -0. 180 0. 138
DL vs DP 1 0.96 0.96 0.86 0.94 0.001 0.064 -0. 127 0. 129
DL vs TM 2 0.99 0.96 0.96 0.98 0.044 0.040 -0.032 0.125
DL vs FL 2 0.99 0.99 0.97 0.98 -0.001 0.040 -0.080 0.077
DL vs DP 2 0.99 0.99 0.94 0.99 0.018 0.026 -0. 034 0.070
  1. 1Including all the respiratory cycles analysed; 2Without the respiratory cycles corresponding to the spontaneous ventilations without anaesthesia test. r: Pearson correlation coefficient; R: reliability coefficient; p: slope of the linear regression line; ρ: Spearman's rank-order correlation coefficient; MEAN: Mean difference; SD: standard deviation; MEAN ± 2SD: limits of agreement of the Blond and Altman analysis; SVN: spontaneous ventilation without anaesthesia respiratory test, SVW: spontaneous ventilation with anaesthesia respiratory test; ILW: inspiratory load with anaesthesia respiratory test.