Now we conducted a diagnosis test study for estimating the diagnostic accuracy a new method.
We calculated the sensitivity, specificity, Positive predictive value (PPV) and NPV by the "epiR "package for R.
As shown figure1, the lower 95% confidence limit of PPV is 0.00.
[0.07 (95%CI 0.00, 0.34)]
What's the meaning of this?
I guess the number was always display 2 decimal place？
Or the number is represented zero？