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Effect of positive and negative likelihood ratio values on pretest probability†
| Positive likelihood ratio | Negative likelihood ratio | Effect on pretest probability |
|---|---|---|
| > 10 | < 0.1 | Pretest probability almost always convincingly changed |
| 5–10 | 0.1–0.2 | Pretest probability is moderately changed |
| 2–5 | 0.2–0.5 | Change in pretest probability is small but can be useful |
| 1–2 | 0.5–1 | Change in pretest probability is very small and usually not useful |
Adapted from Fritz 23.
