Table 4.

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

Sex and symptom categorySpecimenn% Prevalence% Sensitivity% Specificity% PPVa% NPVb
Female
 AsymptomaticEndocervical1,0988.787.499.594.398.8
Urine87.499.695.498.8
 SymptomaticEndocervical1,1389.591.799.292.599.1
Urine90.798.486.099.0
Male
 AsymptomaticUrethral71012.592.198.791.198.9
Urine92.198.489.198.9
 SymptomaticUrethral1,23021.287.498.794.696.7
Urine89.798.594.097.2
  • a PPV, positive predictive value.

  • b NPV, negative predictive value.