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Table 2 BMI categories and mean IAP values

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

BMI (kg/m2) IAPMAL (mmHg) IAPSP (mmHg) p value
20-25 (n = 68) 7.4 ± 2.2 5.4 ± 2.1 < 0.0001a
26-30 (n = 8) 7.4 ± 2.3 5.6 ± 2.8 0.012b
> 30 (n = 24) 12.1 ± 0.8 10.0 ± 1.3 < 0.0001b
p valuec < 0.0001 < 0.0001  
  1. aTwo-sample paired t test; bWilcoxon signed-rank test; cone-way analysis of variance. BMI, body mass index; IAP, intra-abdominal pressure; MAL, midaxillary line; SP, symphysis pubis.