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Table 3 Characteristic analysis of the numerical risk factors associated with post-extubation negative pressure pulmonary edema (NPPE)

From: Characterizing post-extubation negative pressure pulmonary edema in the operating room—a retrospective matched case-control study

Numerical variables Case Matched controls P value
Age 45.1 ± 18.1 49.4 ± 19.7 0.065
Body mass index 24.6 ± 7.6 25.1 ± 5.3 < 0.001*
Duration of operation (min) 167.2 ± 103.8 148.4 ± 92.1 0.022*
Intraoperative morphine (mg) 2.0 ± 2.9 3.1 ± 9.6 0.247
Intraoperative fluid (ml) 1456.3 ± 906.3 1040.4 ± 947.5 < 0.001*
Intraoperative urine output (ml) 256.3 ± 394.5 147.8 ± 286.8 0.004*
Estimated blood loss (ml) 156.3 ± 272.4 128.3 ± 272.8 0.091
  1. Data were analyzed by Wilcoxon signed-rank test and are shown as mean ± SD. *P < 0.05 is considered statistically significant