TABLE 1.
Characteristics and outcomes.
| Characteristic | Total (n = 19) | NLOP (n = 8) | LOP (n = 11) | p Value |
|---|---|---|---|---|
| Age, year | 64 (52, 70) | 70 (53, 73) | 63 (52, 68) | 0.342 |
| Male, n (%) | 7 (37) | 3 (38) | 4 (36) | 1.000 |
| BMI (kg/m2) | 25 (21, 27) | 22 (17, 25) | 26 (25, 28) | 0.009 |
| BMI (kg/m2)-no ECMO | 24 (19, 26) | 21 (17.25) | 26 (23, 29) | 0.018 |
| APACHE II | 19 (16, 20) | 18 (18, 19) | 20 (14, 24) | 0.648 |
| SOFA | 13 (11, 14) | 14 (11, 14) | 12 (10, 14) | 0.560 |
| ARDS-risk factor | 0.338 | |||
| Extrapulmonary | 5 (26) | 1 (12) | 4 (36) | |
| Pulmonary | 14 (74) | 7 (88) | 7 (64) | |
| Lesion | 1.000 | |||
| Diffuse, n (%) | 8 (42) | 3 (38) | 5 (45) | |
| Focal, n (%) | 11 (58) | 5 (62) | 6 (55) | |
| Grade | 0.367 | |||
| Mild | 6 (32) | 4 (50) | 2 (18) | |
| Moderate | 12 (63) | 3 (38) | 9 (82) | |
| Severe | 1 (5) | 1 (12) | 0 (0) | |
| ECMO, n (%) | 5 (26) | 1 (12) | 4 (36) | 0.338 |
| ICU length of stay (d) | 32 (16, 44) | 32 (18, 77) | 32 (16, 44) | 0.756 |
| In-ICU mortality (%) | 4 (21) | 4 (50) | 0 (0) | 0.018 |
| Hospital mortality (%) | 7 (37) | 6 (75) | 1 (9) | 0.006 |
LOP, the patients whose optimal PEEP was lower in the prone than in the supine position; NLOP, the patients with the optimal PEEP, not lower in the prone position; BMI, body mass index; APACHE II, Acute Physiology and Chronic Health Evaluation II; SOFA, Sequential Organ-Failure Assessment; ARDS, acute respiratory distress syndrome; PEEP, positive end-expiratory pressure; ECMO, extracorporeal membrane oxygenation; ICU, intensive care unit.