Risk of VTE by patient risk category (low, medium, or high), stratified by early postoperative antithrombotic use (received vs did not receive), with RRs estimated using Poisson regression
| . | Patient VTE risk category . | ||
|---|---|---|---|
| Low . | Medium . | High . | |
| Received | |||
| RR (95% CI); P value | 1.00 (reference) | 1.32 (0.77-2.29); P = .315 | 2.86 (1.33-5.90); P = .005 |
| n/N (%) | 35/4242 (0.8%) | 20/1832 (1.1%) | 9/382 (2.4%) |
| Did not receive | |||
| RR (95% CI); P value | 1.00 (Ref) | 1.91 (0.90-4.04); P = .092 | 5.41 (1.29-22.63); P = .021 |
| n/N (%) | 21/4087 (0.5%) | 10/1021 (1.0%) | 2/72 (2.8%) |
| . | Patient VTE risk category . | ||
|---|---|---|---|
| Low . | Medium . | High . | |
| Received | |||
| RR (95% CI); P value | 1.00 (reference) | 1.32 (0.77-2.29); P = .315 | 2.86 (1.33-5.90); P = .005 |
| n/N (%) | 35/4242 (0.8%) | 20/1832 (1.1%) | 9/382 (2.4%) |
| Did not receive | |||
| RR (95% CI); P value | 1.00 (Ref) | 1.91 (0.90-4.04); P = .092 | 5.41 (1.29-22.63); P = .021 |
| n/N (%) | 21/4087 (0.5%) | 10/1021 (1.0%) | 2/72 (2.8%) |
Low risk was BMI <35 kg/m2, age <75 years, without history of VTE. Medium risk was BMI ≥35 kg/m2 or age ≥75 years, without a history of VTE. High risk was history of VTE or both BMI ≥35 kg/m2 and age ≥75 years. The table presents both relative risks (RRs) and absolute 30-day event rates of VTE. RRs and 95% CIs were estimated in a Poisson regression model with a robust variance estimator.