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Table 2 Statistically significant comparisons of during spontaneous breathing trial (SBT) variability

From: Do heart and respiratory rate variability improve prediction of extubation outcomes in critically ill patients?

Variability domain Measure name Passed (n = 383) Failed (n = 51) P value
Statistical HRV Mean of the differences 1.4 10−6 (−9.4 10−7, 3.7 10−6) −8.4 10−6 (−1.5 10−5, −1.9 10−6) 0.00278
Geometric RRV Recurrence quantification analysis: average diagonal line 0.0057 (0.0054, 0.0060) 0.0044 (0.0038, 0.0053) 0.00011
  RRV Recurrence quantification analysis: maximum diagonal line 0.021 (0.020, 0.022) 0.016 (0.015, 0.018) 0.00004
  RRV Recurrence quantification analysis: maximum vertical line 0.017 (0.016, 0.018) 0.012 (0.011, 0.014) 0.00017
  RRV Recurrence quantification analysis: trapping time 0.0048 (0.0046, 0.0050) 0.0038 (0.0030, 0.0042) 0.00009
Informational RRV Fano factor distance from a Poisson distribution −0.12 (−0.12, −0.11) −0.15 (−0.17, −0.12) 0.00166
Energetic RRV Hjorth parameters: activity 11.1 (10.4, 11.8) 7.8 (6.0, 10.7) 0.00406
Invariant HRV Power Law (based on frequency) x intercept 15.8 (14.8, 17.3) 10.0 (4.5, 13.9) 0.00255
  RRV Largest Lyapunov exponent 1.02 (1.00, 1.02) 1.07 (1.03, 1.14) 0.00151
  RRV Power Law (based on histogram) y intercept −2.17 (−2.21, −2.10) −2.35 (−2.59, −2.15) 0.00259
  1. For specific details about each measure, refer to [28]. HRV, heart rate variability; RRV, respiratory rate variability.