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. 2008 Apr 1;58(549):273–276. doi: 10.3399/bjgp08X279779

Table 1.

Variation in posterior probability according to prior probability.

Prior probability, % Prior odds Posterior odds after applying a LR of 5 Posterior probability, % Net increase in probability, %
10 0.11 0.55 35.5 25.5

20 0.25 1.25 55.5 35.5

30 0.43 2.15 68.3 38.3

LR = likelihood ratio.