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Table 3 BMI and IAP values in regard to the type of surgery

From: Effects of zero reference position on bladder pressure measurements: an observational study

Type of surgery BMI (kg/m2) IAP (mmHg)
    MAL SP p value CI (95%)
Emergency (n = 55) 22.1 ± 2.1 7.4 ± 1.9 5.4 ± 2.0 < 0.0001b 1.5-2.4
Elective Bariatric (n = 24) 42.4 ± 10.0 12.1 ± 0.8 10.0 ± 1.3 < 0.0001b 1.5-2.6
  Non-bariatric (n = 21) 23.1 ± 2.5 7.1 ± 2.7 5.4 ± 2.4 0.002b 0.7-2.6
  Total (n = 45) 30.5 ± 18.1a 9.8 ± 3.1 7.8 ± 2.9 < 0.0001b 1.6-2.4
  1. aMedian ± IQR; bTwo-sample paired t test;cWilcoxon signed-rank test; BMI, body mass index; IAP, intra-abdominal pressure; MAL, midaxillary line; SP, symphysis pubis.