Table 2 Preoperative, and operative data of stratified by BMI categories
| Variables |
normal weight group 18.5–23.9 kg/m2 (N = 248) | overweight group 24–27.9 kg/m2 (N = 408) | obese group ≥28 kg/m2 (N = 121) | P-value |
|---|---|---|---|---|
| Preoperative | ||||
| Systolic BP (mm/Hg), mean (SD) | 133.7 ± 27.4 | 143.6 ± 31.0 | 147.1 ± 27.9 | < 0.001a |
| Diastolic BP (mm/Hg), mean (SD) | 71.9 ± 14.7 | 76.8 ± 17.8 | 78.1 ± 15.7 | < 0.001a |
| PP (mm/Hg), mean (SD) | 61.7 ± 21.1 | 67.0 ± 23.5 | 69.0 ± 22.8 | 0.003a |
| Heart rate, mean (SD) | 80.7 ± 16.0 | 81.7 ± 17.3 | 83.6 ± 14.8 | 0.296a |
| WBC (×109/l), mean (SD) | 11.3 ± 3.8 | 12.9 ± 4.2 | 13.4 ± 4.4 | < 0.001a |
| Neutrophil (× 109/L), mean (IQR) | 22.7 (19.0–26.4) | 26.9 (23.8–30.0) | 21.0 (16.4–25.6) | 0.082b |
| Lymphocyte (× 109/L), median (IQR) | 2.6 (2.0–3.1) | 2.6 (2.2–3.0) | 2.3 (1.4–3.1) | 0.734b |
| Platelet (× 109/L), median (IQR) | 184.3 (174.7–194.0) | 182.1 (175.4–188.9) | 189.4 (178.6–200.2) | 0.607b |
| Creatinine (umol/L), median (IQR) | 98.5 (92.0,105.0) | 119.4 (108.7130.2) | 99.8 (90.2109.4) | 0.005b |
| Hemoglobin(g/l), mean (SD) | 122.9 ± 18.5 | 128.5 ± 19.4 | 136.1 ± 18.0 | < 0.001a |
| Serum albumin (g/dL), mean (SD) | 3.5 ± 0.4 | 3.7 ± 0.6 | 3.8 ± 0.6 | < 0.001a |
| BUN (mmol/L), median (IQR) | 7.0 (6.5–7.4) | 8.5 (6.1–10.9) | 7.1 (6.6–7.7) | 0.506b |
| Operative | ||||
| Operating time (min), median (IQR) | 320.4 (309.2–331.7) | 318.5 (309.8–327.2) | 334.2 (315.7–352.7) | 0.251b |
| CPB time (min), median (IQR) | 168.9 (159.9–177.9) | 162.8 (156.8–168.9) | 172.9 (157.8–188.1) | 0.288b |
| Aortic cross-clamping time (min), median (IQR) | 80.6 (73.5–87.8) | 80.7 (75.7–85.7) | 72.4 (64.7–80.0) | 0.265b |