Table 1.
Characteristics of the critically ill patients in the mechanically ventilated and non-ventilated groups
| 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 | <0.0001b |
| APP | 87.7 ± 17.6 | 85.3 ± 21.7 | 90.1 ± 11.9 | 0.173b |
| IAH | 6 | 6 (12.0) | 0 (0.0%) | 0.027c |
| 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%) | <0.0001c |
aChi-square test with Yates' correction; btwo independent sample t tests; cFisher's exact test; dp 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.