Prophylactic methods for reducing deep venous thrombosis or pulmonary embolism or both at 7–14 days after colorectal surgery*
| Comparisons | Weighted event rates | RRR (95% CI) | NNT (CI) |
|---|---|---|---|
| Any heparin v no treatment or placebo | 5.5% v 16.7% | 60% (38 to 74) | 9 (7 to 16) |
| RRI (CI) | NNH (CI) | ||
|---|---|---|---|
| *LDH = low dose unfractionated heparin. Other abbreviations defined in glossary; RRR, RRI, NNT, NNH, and CI calculated from data in article. | |||
| LDH alone v LDH and compression stockings | 21.1% v 5.1% | 314% (22 to 1304) | 7 (4 to 28) |