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Multivariate analysis of risk factors of gastrointestinal bleeding in patients taking warfarin.
| Variable | Relative risk | 95% confidence interval | P value |
|---|---|---|---|
| Age > 65 yrs | 2.5 | 1.2–5.5 | 0.02 |
| Mean INR* > 2.1 | 2.1 | 1.0–4.2 | 0.04 |
| History of GIB† | 5.1 | 1.9–13.5 | 0.001 |
| Cirrhosis | 6.9 | 2.0–24.5 | 0.003 |
*INR: international normalization ratio.
†GIB: gastrointestinal bleeding.
