Table 1.

Demographic and summary characteristics of ALTA sub-groups

Characteristic	Male (n = 54)	Female (n = 46)	P value
Age	47.74 ± 2.23	54.30 ± 2.042	0.035
APACHE III score	93.40 ± 3.83	90.96 ± 4.51	0.679
PaO2/FIO2	151.80 ± 8.76	130.44 ± 7.76	0.076
Primary cause of ARDS, %
Aspiration	18.5	13	0.457
Multiple transfusion	1.9	2.2	0.909
Other	3.7	8.7	0.295
Pneumonia	38.9	37	0.843
Sepsis	20.4	37	0.066
Trauma	16.7	2.2	0.016
Ventilator-free days	13.91 ± 1.39	15.72 ± 1.50	0.378
ICU-free days	12.87 ± 1.18	14.63 ± 1.43	0.342
Organ failure-free days	14.59 ± 1.37	14.09 ± 1.65	0.813

Means and standard error of mean (SEM)s were reported for continuous variables

APACHE III score Acute Physiology, Age and Chronic Health Evaluation; PaO₂ partial pressure of oxygen, FIO₂ fraction of inspired oxygen