Table 2: Baseline characteristics of patients who received prior therapy and those who did not.

VariableGroup A ()Group B () value

Age, yr62.9 ± 18.156.0 ± 20.80.028
Male72 (77.4%)45 (69.2%)0.248
Primary diagnosis at admission0.018
 Respiratory56 (60.2%)34 (52.3%)0.323
 Trauma17 (18.3%)20 (30.8%)0.068
 Acute abdominal disease2 (2.2%)6 (9.2%)0.046
 Cardiopulmonary resuscitation2 (2.2%)2 (3.1%)0.715
 Operation9 (9.7%)0 (0.0%)0.011
 Other7 (7.5%)3 (4.6%)0.460
Predisposing conditions
Category0.088
 Shock8 (8.6%)4 (6.2%)0.568
 Sepsis40 (43.0%)17 (26.2%)0.030
 Pancreatitis2 (2.2%)4 (6.2%)0.195
 Pneumonia79 (84.9%)41 (63.1%)0.002
 High-risk surgery3 (3.2%)1 (1.5%)0.506
 Trauma16 (17.2%)20 (30.8%)0.046
Number0.563
 Include 1 factor: n (%)42 (45.2%)34 (52.3%)0.376
 Include 2 factors: n (%)39 (41.9%)24 (36.9%)0.527
 Include 3 factors: n (%)10 (10.8%)7 (10.8%)0.997
 Include 4 factors: n (%)2 (2.2%)0 (0.0%)0.234
APACHE2 score15.9 ± 6.615.6 ± 6.60.743
LIPS5.1 ± 2.24.2 ± 1.80.017
60-day outcome23 (24.7%)14 (21.5%)0.641
Morbidity of ARDS26 (28.0%)19 (29.2%)0.861

Group A: patients who had received therapy before admission; group B: patients who had not received therapy before admission. , .