Likelihood ratios and bedside estimates of probability
| Likelihood ratio | Approximate change in probability |
|---|---|
| 0.1 | −45% |
| 0.2 | −30% |
| 0.3 | −25% |
| 0.4 | −20% |
| 0.5 | −15% |
| 1 | No change |
| 2 | +15% |
| 3 | +20% |
| 4 | +25% |
| 5 | +30% |
| 6 | +35% |
| 8 | +40% |
| 10 | +45% |
Values between 0 and 1 (negative likelihood ratios) decrease the probability of disease; values greater than 1 (positive likelihood ratios) increase the probability of disease.
From McGee S. Simplifying likelihood ratios. J Gen Intern Med 2002; 17:647–650.