Table 2.
Univariate analysis of risk factors associated with postoperative complications
| Characteristic | OR | 95%CI | P value |
| Age ≥ 75 yr | 1.330 | 0.476-3.715 | 0.586 |
| Sex | 0.642 | 0.342-1.202 | 0.166 |
| BMI of < 18.5 kg/m2 | 0.277 | 0.034-2.232 | 0.228 |
| Comorbidities | |||
| Diabetes mellitus | 3.259 | 1.128-9.414 | 0.029 |
| Hypertension | 0.728 | 0.382-1.389 | 0.336 |
| Preoperative serum albumin of < 35 g/L | 1.048 | 1.018-1.109 | 0.015 |
| Preoperative hemoglobin of < 120 g/L | 1.487 | 0.817-2.705 | 0.194 |
| Preoperative CRP of ≥ 10 g/L | 1.336 | 0.512-3.486 | 0.553 |
| CA 19-9 of ≥ 37 ng/mL | 1.328 | 0.647-2.723 | 0.439 |
| CEA of ≥ 5 ng/mL | 1.177 | 0.483-2.865 | 0.720 |
| Lymphocyte count of ≥ 3 × 109/L | 0.314 | 0.038-2.560 | 0.279 |
| CRP on POD 3 in mg/L | 4.653 | 2.435-8.889 | < 0.001 |
| △ALB of ≥ 14.0% | 16.837 | 6.403-44.275 | < 0.001 |
| ASA of ≥ 3 | 1.007 | 0.559-1.815 | 0.981 |
| Clinical stage of ≥ II | 1.798 | 1.255-2.686 | 0.009 |
| Mode of surgical approach | 1.206 | 0.588-2.475 | 0.610 |
| Type of resection | 1.291 | 1.006-1.896 | 0.013 |
| Degree of lymph node dissection ≥ 2 | 2.263 | 0.948-5.399 | 0.066 |
| Operation time of ≥ 250 min | 1.621 | 0.896-2.931 | 0.110 |
| Blood loss of ≥ 200 mL | 1.417 | 0.758-2.651 | 0.275 |
∆ALB: (Albumin level before surgery-albumin on POD 1)/albumin level before surgery × 100%; ASA: American Society of Anesthesiologists; BMI: Body mass index; CA 19-9: Carbohydrate antigen 19-9; CEA: Carcinoembryonic antigen; CRP: C-reactive protein; POD: Postoperative day.