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Table 4 Post-test probability of group A β-haemolytic streptococcal (GABHS) pharyngitis

From: Predicting streptococcal pharyngitis in adults in primary care: a systematic review of the diagnostic accuracy of symptoms and signs and validation of the Centor score

Points Likelihood ratio Pretest probability of GABHS pharyngitis (%)
   5 10 15 20 25 30 35 40
≥ 1 1.16 6 11 17 22 28 33 38 44
≥ 2 1.76 8 16 24 31 37 43 49 54
≥ 3 2.68 12 23 32 40 47 53 59 64
4 3.85 17 30 40 49 56 62 67 72