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Table 1 Characteristics of the critically ill patients in the mechanically ventilated and non-ventilated groups

From: Effect of mechanical ventilation on intra-abdominal pressure in critically ill patients without other risk factors for abdominal hypertension: an observational multicenter epidemiological study

  Total (n= 100) MV (n= 50) Non-MV (n= 50) p value
Female (n) 50 24 (48%) 26 (52%) 0.841a
Age (years) 46.6 ± 17.0 45.9 ± 15.5 47.3 ± 18.6 0.666b
BMI (kg/m2) 24.3 ± 3.5 24.2 ± 3,5 24.3 ± 3.6 0.893b
APACHE II 8.5 ± 4.7 9.2 ± 5.4 7.8 ± 3.8 0.125b
IAP 5.1 ± 3.7 6.7 ± 4.1 3.5 ± 2.4 <0.0001 b
APP 87.7 ± 17.6 85.3 ± 21.7 90.1 ± 11.9 0.173b
IAH 6 6 (12.0) 0 (0.0%) 0.027 c
Medical 53 (53.0) 26 (52.0%) 27 (54%) 1.000
Surgical 47 (47.0) 24 (48.0%) 23 (46.0%)  
   Elective 31 (66.0%) 18 (72.0%) 13 (59.1%) d
   Emergency 5 (10.6%) 2 (8.0%) 3 (13.6%)  
   Trauma 11 (23.4%) 5 (20.0%) 6 (27.3%)  
ICU stay 5.6 ± 5.5 6.5 ± 6.5 4.6 ± 4.3 0.087b
ICU mortality 21 (21.0%) 18 (36.0%) 3 (6.0%) <0.0001 c
  1. aChi-square test with Yates' correction; btwo independent sample t tests; cFisher's exact test; d p value was not calculated as the expected frequency was <5 in more than 25% of the cells. MV, mechanical ventilation; BMI, body mass index; APACHE, Acute Physiology and Chronic Health Evaluation; IAP, intra-abdominal pressure; APP, abdominal perfusion pressure; IAH, intra-abdominal hypertension; ICU, intensive care unit.