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Table 3 Median, minimum and maximum values obtained according to the three one-minute methods

From: Esophageal impedance baseline according to different time intervals

  Method 1 Method 2 Method 3
  Median Minimum Maximum Median Minimum Maximum Median Minimum Maximum
Channel 1 3,916.4 2,664.4 4,861.1 3,836.1 2,719.3 4,533.9 3,906.3 2,848.0 5,098.2
Channel 2 3,788.9 2,504.7 4,766.6 3,721.6 2,611.1 4,812.3 3,805.3 2,655.2 4,847.2
Channel 3 3,443.1 2,328.2 4,674.6 3,468.5 2,363.0 4,756.4 3,565.5 2,513.0 5,463.0
Channel 4 3,501.5 2,434.6 4,532.4 3,508.0 2,291.0 4,945.5 3,470.1 2,124.7 5,188.0
Channel 5 3,859.0 2,757.0 5,535.2 3,833.5 2,642.8 5,862.3 3,770.6 2,287.7 5,619.2
Channel 6 3,567.7 2,065.3 4,886.5 3,517.7 1,967.5 4,892.4 3,510.4 1,992.7 4,910.8
  1. Median basal impedance according to the first stable minute without impedance event, every hour (method 1), every 2 hours (method 2) and every 4 hours (method 3).
  2. The median and range of the three one-minute methods are shown in Table 3. The variation in the IB according to the three methods was small (mean 2.5%, range 0.47% to 5.55%) (Table 4), but the variability was high (up to 45.5%) (Table 5). The difference in the median IB between the one-minute methods seems not to differ if compared with the IB over the total registration when excluding or maintaining all IEs (Tables 2 and 6). The high variability indicates that the IB is not really stable during a period of one minute without IE throughout the registration time. Variability is largest with method 3.