Table 4. Imputed Positive and Negative Likelihood Ratios Calculated for Each Practitioner Based on Their Pretest and Posttest Positive or Negative Responses .
| Test and LR result | Scientific evidence of likelihood ratio | Imputed LR, median (IQR) | ||
|---|---|---|---|---|
| Resident physician | Attending physician | Nurse practitioner or physician assistant | ||
| Chest radiography for pneumonia | ||||
| Positive | 2.57 | 4.75 (2.25-11.00) | 5.21 (2.25-52.58) | 9.00 (2.15-111.00) |
| Negative | 0.33 | 0.35 (0.12-0.67) | 0.21 (0.06-0.44) | 0.25 (0.06-0.42) |
| Mammography for breast cancer | ||||
| Positive | 13.00-33.00 | 36.00 (9.00-196.00) | 54.79 (13.22-428.14) | 19.00 (4.00-49.00) |
| Negative | 0.05-0.24 | 1.00 (0.47-1.26) | 1.00 (0.44-1.00) | 1.00 (0.33-1.56) |
| Exercise stress test for cardiac ischemia | ||||
| Positive | 2.03-2.65 | 22.67 (8.12-81.00) | 19.00 (5.44-73.50) | 51.00 (9.00-218.50) |
| Negative | 0.51-0.56 | 0.50 (0.17-1.00) | 0.58 (0.11-1.00) | 0.59 (0.26-1.00) |
| Urine culture for UTI | ||||
| Positive | 9.00 | 5.10 (1.89-44.33) | 16.86 (3.00-147.00) | 27.00 (8.14-333.00) |
| Negative | 0.11 | 0.16 (0.02-0.58) | 0.11 (0.01-0.47) | 0.12 (0.01-0.63) |
Abbreviations: IQR, interquartile range; LR, likelihood ratio; UTI, urinary tract infection.