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Table 3 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).

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

  DL vs. TM DL vs. FL DL vs. DP
  r R p ρ r R p ρ r R p ρ
Dog 1 (SVN) 0.61 -0.44 0.43 0.58 0.12 -0.82 0.71 0.23 0.14 -0.74 0.059 0.15
Dog 2 (SVN) 0.91 0.77 1.00 0.84 0.72 0.73 0.65 0.81 0.90 0.89 0.76 0.87
Dog 3 (SVN) 0.77 0.39 0.68 0.79 0.63 0.45 0.72 0.65 058. 0.56 0.38 0.53
Dog 1 (SVW) 0.62 0.62 0.60 0.64 0.54 0.39 0.42 0.55 0.37 0.23 0.32 0.42
Dog 2 (SVW) 0.69 0.47 0.80 0.66 0.51 0.15 0.74 0.51 0.85 0.69 0.94 0.83
Dog 3 (SVW) 0.60 0.23 0.55 0.58 0.59 0.62 0.71 0.56 0.26 0.24 0.46 0.32
Dog 1 (ILW) 0.99 0.92 0.99 0.99 1.00 0.99 1.00 0.99 1.00 0.98 0.99 0.99
Dog 2 (ILW) 0.97 0.79 1.04 0.96 0.91 0.85 1.31 0.93 0.98 0.97 1.00 0.96
Dog 3 (ILW) 0.98 0.97 0.94 0.98 0.98 0.97 1.01 0.97 0.97 0.86 0.99 0.97
  1. r: Pearson correlation coefficient; R: reliability coefficient; p: slope of the linear regression line; ρ: Spearman's rank-order correlation coefficient; SVN: spontaneous ventilation without anaesthesia respiratory test, SVW: spontaneous ventilation with anaesthesia respiratory test; ILW: inspiratory load with anaesthesia respiratory test.