Table 5.
BI-RADS categories and PPV by screening unit
| Screening unit | Screening examination n (%) | Positive examination n (%) | BI-RADS 0 n (%) | TP (PPV) | BI-RADS 4 n (%) | TP (PPV) | BI-RADS 5 n (%) | TP (PPV) | FN n | Programme sensitivity % (95 % CI) | Specificity % (95 % CI) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 28,138 | 476 (30.1) | 127 (26.7) | 16 (12.6) | 297 (62.4) | 88 (29.6) | 52 (10.9) | 48 (92.3) | 70 | 68 (62-74) | 99 (99-99) |
| 2 | 18,758 | 308 (20.0) | 186 (60.4) | 20 (10.8) | 94 (30.5) | 34 (36.2) | 28 ( 9.1) | 27 (96.4) | 50 | 62 (54-70) | 99 (99-99) |
| 3 | 1,8758 | 257 (16.6) | 137 (53.3) | 27 (19.7) | 85 (33.1) | 43 (50.6) | 35 (13.6) | 33 (94.3) | 58 | 64 (56-71) | 99 (99-99) |
| 4 | 28,138 | 504 (32.6) | 361 (71.6) | 51 (14.1) | 102 (20.2) | 61 (59.8) | 41 (8.1) | 37 (90.2) | 75 | 66 (60-72) | 99 (99-99) |
| Total | 93,793 | 1,545 (100) | 811 (52.5) | 114 (14.1) | 578 (37.4) | 226 (39.1) | 156 (10.1) | 145 (92.9) | 253 | 66 (63-96) | 99 (99-99) |
TP true positive screening examination, FN false negative screening examination