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Table 4 Variation of the three one-minute methods according to median impedance baseline over the 24 hour recording, with and without impedance events

From: Esophageal impedance baseline according to different time intervals

   Method 1 (%) Method 2 (%) Method 3 (%)
Channel 1 24 h with IE −3.77 −5.38 −3.89
  24 h without IE −0.35 −2.06 −0.14
Channel 2 24 h with IE −0.69 −2.49 0.24
  24 h without IE −0.93 −2.69 0.14
Channel 3 24 h with IE −0.71 −0.11 2.79
  24 h without IE −2.39 −1.78 1.26
Channel 4 24 h with IE −0.28 −0.67 −2.18
  24 h without IE −2.94 −3.35 −4.97
Channel 5 24 h with IE 2.59 1.53 0.16
  24 h without IE −2.30 −3.15 −4.21
Channel 6 24 h with IE 0.44 −0.98 −0.87
  24 h without IE −4.06 −5.44 −5.15
  1. Variation expresses the difference in the impedance baseline according to the different methods. Negative values mean that the values obtained with the method are lower than that obtained during the 24 h recording. IE: impedance event.