Item | Control group (n = 87) | Study group (n = 19) | P value |
age (year) | 72.4 ± 7.8 | 72.8 ± 7.5 | P > 0.05 |
males/females | 1.52 | 1.54 | P > 0.05 |
BMI (kg/m2) | 21.24 ± 4.78 | 20.88 ± 5.05 | P > 0.05 |
oxygenation index (mmHg) | 185 ± 32 | 183 ± 35 | P > 0.05 |
hemoglobin (g/L) | 91 ± 5.6 | 89 ± 6.1 | P > 0.05 |
APACHE II | 18.7 ± 3.9 | 19.1 ± 4.3 | P > 0.05 |
lactic acid (mmol/L) | 1.34 ± 0.43 | 1.28 ± 0.48 | P > 0.05 |