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

Annals of Intensive Care

Table 8 Characteristics of the critically ill patients according to ICU outcome

	Total (n= 100)	Survivors (n= 79)	Non-survivors (n= 21)	p value
Female (n)	50 (50.0%)	42 (53.2%)	8 (16%)	0.326^a
Age (years)	46.6 ± 17.0	46.1 ± 17.2	48.2 ± 16.4	0.537^b
BMI (kg/m²)	24.3 ± 3.5	24.3 ± 3.7	24.08 ± 2.7	0.787^b
APACHE II	8.5 ± 4.7	7.9 ± 4.2	10.9 ± 5.7	0.022 ^b
IAP	5.1 ± 3.7	5.2 ± 3.7	4.8 ± 3.9	0.651^b
APP	87.7 ± 17.6	88.5 ± 14.1	84.4 ± 27.4	0.488^b
IAH	6 (6.0%)	2 (9.5%)	4 (5.1%)	0.603^c
Medical	53 (53.0%)	38 (48.1%)	15 (71.4%)	0.097^a
Surgical	47 (47.0%)	41 (51.9%)	6 (28.6%)
Elective	31	30 (38.0%)	1 (4.8%)	^d
Emergency	5	5 (6.3%)	0 (0.0)
Trauma	11	6 (7.6%)	5 (23.8%)
ICU stay	5.6 ± 5.5	5.4 ± 5.7	6.4 ± 5.0	0.283^b

^aChi-square test with Yates' correction; ^bMann-Whitney U test; ^cFisher's exact test; ^d p value was not calculated as the expected frequency was <5 in more than 25% of the cells. 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.