Table 4

The diagnostic values of non-treponemal titres before treatment for CS stratified by two treatment groups

SubgroupAUC
(95% CI)
Sensitivity
(95% CI)
Specificity
(95% CI)
PPV
(95% CI)
NPV
(95% CI)
Youden’s index
Untreated during pregnancy0.80 (0.72 to 0.88)81.5 (66.8 to 96.1)78.5 (72.3 to 84.6)37.3 (24.9 to 49.6)96.4 (93.4 to 99.5)0.60
Treated during pregnancy0.73 (0.59 to 0.87)66.7 (40.0 to 93.3)78.8 (76.6 to 81.0)2.7 (0.9 to 4.6)99.6 (99.3 to 100.0)0.45
  • AUC, area under the curve; CS, congenital syphilis; NPV, negative predicted value; PPV, positive predicted value.