Table 5.
Results of sensitivity, specificity, positive predictive value, negative predictive value, accuracy, and Youden index for the cold test with confidence intervals 95% (CI 95%) and at 57% prevalence of IANB failure.
| Estimated value | 95% confidence interval | ||
|---|---|---|---|
| Lower limit | Upper limit | ||
| Prevalence | 0.57 (57%) | 0.433 | 0.705 |
| Sensitivity | 0.87 (87%) | 0.702 | 0.964 |
| Specificity | 0.91 (91%) | 0.719 | 0.989 |
|
| |||
| For any particular test result, the probability that it will be: | |||
| Positive | 0.54 (54%) | 0.397 | 0.672 |
| Negative | 0.46 (46%) | 0.328 | 0.603 |
|
| |||
| For any particular positive test result, the probability that it is: | |||
| True positive (positive predictive value-PPV) | 0.93 (93%) | 0.781 | 0.981 |
| False positive | 0.07 (7%) | 0.012 | 0.242 |
|
| |||
| For any particular negative test result, the probability that it is: | |||
| True negative (negative predictive value-NPV) | 0.84 (84%) | 0.676 | 0.930 |
| False negative | 0.16 (16%) | 0.052 | 0.369 |
| Accuracy | 0.89 (89%) | 0.774 | 0.958 |
| Youden index | 0.78 (78%) | 0.421 | 0.953 |