Table 2 Outcomes before and after propensity matching
From: Maintaining moderate versus lower PEEP after cardiac surgery: a propensity-scored matched analysis
Variable | Before Matching | After Matching | ||||
|---|---|---|---|---|---|---|
Lower PEEP (n = 232) | Moderate PEEP (n = 102) | P value | Lower PEEP (n = 79) | Moderate PEEP (n = 79) | P value | |
Duration of MV, days | 0.445 | 0.050 | ||||
1 | 136 (58.6) | 66 (64.7) | 44 (55.7) | 57 (72.2) | ||
2 | 47 (20.3) | 15 (14.7) | 20 (25.3) | 9 (11.4) | ||
≥ 3 | 49 (21.1) | 21 (20.6) | 15 (19.0) | 13 (16.5) | ||
ICU admission-to-T piece, days (%) | 0.196 | 0.298 | ||||
≤ 1 | 172 (74.1) | 83 (81.4) | 62 (78.5) | 68 (86.1) | ||
> 1 | 60 (25.9) | 19 (18.6) | 17 (21.5) | 11 (13.9) | ||
Extubation after the first T-piece trial, n (%) | 174 (74.6) | 78 (76.5) | 0.816 | 52 (65.8) | 65 (82.3) | 0.029 |
ICU length of stay, days | 3 (2–4) | 3 (2–4) | 0.828 | 3 (2–5) | 3 (2–4) | 0.220 |
PaO2 at 24 h, mm Hg | 99 (83–120) | 100 (88–127) | 0.359 | 95 (83–106) | 102 (89–132) | 0.039 |
P/F ratio at 24 h, mm Hg | 308 (262–383) | 322 (251–413) | 0.520 | 300 (253–344) | 330 (254–427) | 0.048 |
Lowest PaO2 within 24 h, mm Hg | 87 (73–102) | 91 (77–105) | 0.114 | 83 (74–98) | 91 (77–112) | 0.031 |
Lowest P/F ratio within 24 h, mm Hg | 272 (221–333) | 274 (234–339) | 0.314 | 262 (217–310) | 269 (234–362) | 0.046 |
Prone positioning in ICU, n (%) | 44 (19.1) | 12 (11.8) | 0.135 | 14 (17.9) | 8 (10.1) | 0.237 |