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Table 3 Assay performance simulating high-volume CT/NG testing (n = 556), results for Neisseria gonorrhoeae*

From: High-volume workflow and performance comparisons for Chlamydia trachomatis and Neisseria gonorrhoeae testing using automated molecular platforms

  Aptima Combo 2  
NG positive NG negative Total
cobas CT/NG NG positive 4 1 5
NG negative 0 551 551
Total 4 552 556
PPA (95% CI), NPA (95% CI) 100 (39.8, 100) 99.8 (99, 100)  
OPA (95% CI) 99.8 (99, 100)   
p-value 1   
  1. *Comparison of cobas CT/NG for use on the cobas 6800 system and Aptima Combo 2 on the Panther system
  2. Calculated using McNemar’s test
  3. Abbreviations: CI confidence interval, NG Neisseria gonorrhoeae, NPA negative percent agreement, OPA overall percent agreement, PPA positive percent agreement