Effects of patient-related factors on venous thromboembolism.
| Factor | Univariate | Multivariate | ||
| OR (95% CI) | P | OR (95% CI) | P | |
| Age (+1 y) | 2.91 (1.27–6.70) | 0.011 | 1.85 (0.73–4.66) | 0.18 |
| Women | 1.17 (0.28–4.77) | 0.82 | ||
| Preoperative Japanese Orthopedic Association score | 0.76 (0.55–1.55) | 0.096 | ||
| Fusion | 1.18 (0.31–4.47) | 0.80 | ||
| Fused vertebral levels | 1.21 (1.00–1.46) | 0.047 | 1.25 (0.97–1.60) | 0.080 |
| Surgical time | 1.01 (1.00–1.01) | 0.043 | ||
| Blood loss volume | 1.00 (1.00–1.01) | 0.015 | ||
| Preoperative D-dimer | 1.61 (1.25–2.07) | <0.01 | 1.20 (0.94–1.52) | 0.14 |
| Postoperative D-dimer | 1.60 (1.33–1.92) | <0.01 | 1.54 (1.23–1.94) | <0.01 |
| Diabetes mellitus | 2.07 (0.50–8.51) | 0.31 | ||
| Hypertension | 1.03 (0.25–4.19) | 0.96 | ||
| Rheumatoid arthritis | 3.56 (0.40–31.0) | 0.25 | ||
| Cardiovascular disease | 6.40 (1.64–24.9) | <0.01 | 9.52 (1.08–84.0) | 0.042 |
| Cancer | 1.37 (0.16–11.4) | 0.76 | ||
| Dialysis | 5.66 (0.62–51.6) | 0.12 | ||
Abbreviation: CI, confidence interval.