Summary of post-test probability according to the prevalence and predicted positive likelihood ratio.

LR+, predicted positive likelihood ratio. The LR+ = 328.33 derived from the equation (sensitivity/1-specificity) with a sensitivity = 98.5% and specificity = 99.7% in derivation phase.aThe prevalence was calculated based on the culture-positive PTB probability in the derivation phase (132/4140).bThe prevalence was calculated based on the culture-positive PTB probability in validation phase (147/4105).