Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Statistical analysis
| Test characteristic | Result | 95% confidence interval |
|---|---|---|
| Sensitivity (%) | 88.0 | 67.6–96.9 |
| Specificity (%) | 90.1 | 86.6–92.8 |
| Positive predictive value (%) | 35.4 | 24.0–48.7 |
| Negative predictive value (%) | 99.2 | 97.4–99.8 |
| Positive likelihood ratio | 8.9 | 6.4–12.3 |
| Negative likelihood ratio | 0.1 | 0.05–0.39 |
