Table 1:
Mapping coverage for disease and drug clinical terminologies used across the entire cohort in raw CPRD, HES, and ONS and converted to the OMOP CDM standard dictionary
| Total unique terms in terminology | Total mapped terms (%) | Unique terms used in events | Used mapped terms (%) | Total unique events | Total excluded events (%) | Total mapped events (%) | |
|---|---|---|---|---|---|---|---|
| Read | 111 163 | 82.13 | 67 886 | 97.58 | 320 328 788 | 0.22 | 97.42 |
| ICD-9 | 6519 | 99.98 | 495 | 100 | 13 130 | 0.92 | 100 |
| ICD-10 | 17 934 | 85.85 | 10 158 | 90.44 | 31 905 144 | 0.01 | 99.09 |
| OPCS-4 | 11 000 | 99.01 | 8474 | 99.45 | 8 453 813 | 0 | 99.88 |
| Drugs | 66 970 | 60.09 | 40 647 | 62.53 | 264 589 509 | 1 | 92.67 |
| Units | 287 | 45.29 | 22 | 72.72 | 27 036 | 1.55 | 99.95 |
| Entity types—laboratory results | 259 | 51.35 | 245 | 54.28 | 125 581 411 | 0.59 | 54.06 |
| Entity types—test | 324 | 97.22 | 324 | 97.22 | 151 645 201 | 12.24 | 98.16 |