Table 1 Number of true and false matches made between image and Patient Management System records within each practice by each rule when compared to manual matching after step 1. True positive and false positive rates provided in brackets
From: Novel linkage approach to join community-acquired and national data
Practice (number of patients) | Match step | True positive (rate) | True negative | False positive (rate) | False negative | Number of images |
|---|---|---|---|---|---|---|
Practice #1 (2,339) | Â | Â | Â | Â | Â | Â |
| Â | 1 | 18,699 (0.859) | 4,890 | 0 (0) | 3,079 | 26,668 |
| Â | 2 | 19,338 (0.888) | 4,881 | 0 (0) | 2,449 | 26,668 |
| Â | 3 | 20,696 (0.95) | 4,881 | 0 (0) | 1,091 | 26,668 |
| Â | 4 | 20,735 (0.951) | 4,866 | 0 (0) | 1,067 | 26,668 |
| Â | 5 | 21,495 (0.986) | 4,823 | 43 (0.009) | 307 | 26,668 |
| Â | 6 | 21,547 (0.988) | 4,788 | 78 (0.016) | 255 | 26,668 |
Practice #2 (309) | Â | Â | Â | Â | Â | Â |
| Â | 1 | 1,003 (0.836) | 803 | 0 (0) | 197 | 2,003 |
| Â | 2 | 1,043 (0.869) | 803 | 0 (0) | 157 | 2,003 |
| Â | 3 | 1,133 (0.944) | 803 | 0 (0) | 67 | 2,003 |
| Â | 4 | 1,133 (0.944) | 803 | 0 (0) | 67 | 2,003 |
| Â | 5 | 1,155 (0.963) | 803 | 0 (0) | 45 | 2,003 |
| Â | 6 | 1,185 (0.988) | 803 | 0 (0) | 15 | 2,003 |
Practice #3 (133) | Â | Â | Â | Â | Â | Â |
| Â | 1 | 247 (0.911) | 5 | 0 (0) | 24 | 276 |
| Â | 2 | 249 (0.919) | 5 | 0 (0) | 22 | 276 |
| Â | 3 | 263 (0.97) | 5 | 0 (0) | 8 | 276 |
| Â | 4 | 263 (0.97) | 5 | 0 (0) | 8 | 276 |
| Â | 5 | 266 (0.982) | 5 | 0 (0) | 5 | 276 |
| Â | 6 | 269 (0.993) | 5 | 0 (0) | 2 | 276 |