Fig. 2From: Clinic-based evaluation of the dual Xpert CT/NG assay on the GeneXpert System for screening for extragenital chlamydial and gonococcal infections amongst men who have sex with menFagan’s nomograms using real life lowest and highest C. trachomatis prevalence per anatomical site (y-axis on the left represents the pre-test probability, y-axis on the right represents the post-test probability, aqua colour line indicates positive LR; red line indicates negative LR)Back to article page