. Author manuscript; available in PMC: 2018 Mar 1.

Published in final edited form as: Pediatr Infect Dis J. 2017 Mar;36(3):250–255. doi: 10.1097/INF.0000000000001413

Table 4. Performance of the Cape Town clinical decision rule for streptococcal pharyngitis according to scores ranging from 1 to 5.

Treat if Score:	Sens (%)	Spec (%)	PPV (%)	NPV (%)
1	99.0	8.1	22.3	96.9
2	96.6	12.4	22.8	93.3
3	83.7	32.2	24.8	88.1
4	51.2	68.2	30.1	83.9
5	18.2	91.4	36.2	80.7

Sens, sensitivity; Spec, specificity; PPV, positive predictor value; NPV, negative predictive value all expressed as percentages