| FFRNT | Sensitivity (%) | Specificity (%) | Agreement (%) | Kappa |
---|
 | > 4 | < 4 | *(95% CI) | (95% CI) | (95% CI) |  |
---|
PPRNT | Â | Â | Â | Â | Â | Â |
> 4 | 49 | 1 | 98.0 | 100 | 96.6 | 0.96 |
< 4 | 0 | 20 | Â | Â | Â | Â |
- *Fold differences were calculated based on the within and between assay standard deviation of log10 titres within which results from testing a sample twice should fall 95% of the time.