Table 4. Composition of the different groups of residents and overall test characteristics.
| PGY 1/2 (n = 27) | PGY 3/4 (n = 28) | PGY 5/6 (n = 35) | |
|---|---|---|---|
| Number of residents | 10 | 5 | 5 |
| Median number of US examinations per resident (range) | 2.5 (1–6) | 6 (1–14) | 3 (1–16) |
| Sensitivity | 100% (CI 15.81–100%) | 100% (CI 47.82–100%) | 100% (CI 29.24–100%) |
| Specificity | 96% (CI 79.65–99.9%) | 91.43% (CI 76.94–98.2%) | 97.06% (CI 84.67–99.93%) |
| PPV | 66.67% (CI 9.43–99.16%) | 62.5% (CI 24.49–91.48%) | 75% (CI 19.41–99.37%) |
| NPV | 100% (CI 85.75–100%) | 100% (CI 89.11–100%) | 100% (CI 89.42–100%) |
| LR+ | 25 (CI 3.66–170.59) | 11.67 (CI 3.95–34.42) | 34 (CI 4.93–234.47) |
| LR- | 0 | 0 | 0 |
Abbreviations used: CI: 95% confidence interval, LR+: positive likelihood ratio, LR-: negative likelihood ratio, NPV: negative predictive value, PGY: post-graduate year, PPV: positive predictive value.