Sensitivity, specificity, PPV and NPV for the three assays for Chlamydia trachomatis detection
| Sensitivity | 95% CI | Specificity | 95% CI | PPV | 95% CI | NPV | 95% CI | |
|---|---|---|---|---|---|---|---|---|
| Urine C trachomatis | ||||||||
| Presto CT-NG assay | 100.0 | 0.9932 to 1.000 | 99.8 | 0.9896 to 0.9996 | 98.1 | 0.9660 to 0.9895 | 100.0 | 0.9932 to 1.000 |
| Lightmix Kit 480 HT CT/NG | 94.2 | 0.9195 to 0.9585 | 99.8 | 0.9896 to 0.9996 | 96.1 | 0.9416 to 0.9741 | 99.4 | 0.9834 to 0.9978 |
| COBAS Amplicor | 92.3 | 0.8980 to 0.9423 | 99.6 | 0.9864 to 0.9988 | 96.0 | 0.9404 to 0.9733 | 99.2 | 0.9806 to 0.9967 |
| Urethral/cervicovaginal C trachomatis | ||||||||
| Presto CT-NG assay | 100.0 | 0.9933 to 1.000 | 99.8 | 0.9897 to 0.9996 | 97.7 | 0.9611 to 0.9865 | 100.0 | 0.9933 to 1.000 |
| Lightmix Kit 480 HT CT/NG | 100.0 | 0.9933 to 1.000 | 99.6 | 0.9865 to 0.9988 | 97.7 | 0.9611 to 0.9865 | 100.0 | 0.9933 to 1.000 |
| COBAS Amplicor | 100.0 | 0.9933 to 1.000 | 99.8 | 0.9897 to 0.9996 | 97.7 | 0.9611 to 0.9865 | 100.0 | 0.9933 to 1.000 |
NPV, negative predictive value; PPV, positive predicative value.