Table 5.

Sensitivity, specificity, and positive and negative predictive values for the detection of C. trachomatis by COBAS AMPLICOR calculated on a sample basis

Sex and symptom categorySpecimenn% Prevalence% Sensitivity% Specificity% PPVa% NPVb
Female
 AsymptomaticEndocervical1,0987.797.699.594.399.8
Urine8.193.399.695.499.4
 SymptomaticEndocervical1,1389.196.199.292.599.6
Urine9.293.398.586.099.3
Male
 AsymptomaticUrethral71011.798.898.791.199.8
Urine12.592.198.489.198.9
 SymptomaticUrethral1,23019.097.498.794.699.4
Urine20.692.598.594.098.1
  • a PPV, positive predictive value.

  • b NPV, negative predictive value.