Contingency tables showing the summary totals in each of the cells after pooling all the junior doctors
| Pooled data for the junior doctors | ||||||
| High-prevalence population (77%) | Low-prevalence population (13%) | |||||
| Reference standard | Reference standard | |||||
| Positive | Negative | Positive | Negative | |||
| Doctor's diagnosis | ||||||
| Positive | 159 | 22 | 181 | 72 | 50 | 122 |
| Negative | 10 | 28 | 38 | 24 | 602 | 626 |
| Totals | 169 | 50 | 219 | 96 | 652 | 748 |
Note x-rays in the high/low-prevalence population were those interpreted by the radiographer as having a high/low probability of an abnormal feature. The true prevalence is determined by the reference standard.