Table 1.
Clustering Read Codes and Commonly Prescribed Drugs in Wales Between 2000 and 2019 Using the SAIL Databank
| Term | Read code | Clustered drugs | Commonly prescribeda |
| Gastrointestinal drugs | a… | 108 | 19 |
| Cardiovascular drugs | b… | 223 | 27 |
| Respiratory drugs | c… | 110 | 18 |
| CNS drugs | d… | 283 | 29 |
| Drugs used in infections | e… | 204 | 18 |
| Endocrine drugs | f… | 149 | 9 |
| OBS/GYN/UTI drugs | g… | 103 | 7 |
| Chemotherapy/immunosuppressants drugs | h… | 160 | 0 |
| Hematology/dietetic drugs | i… | 172 | 6 |
| Musculoskeletal drugs | j… | 75 | 14 |
| Eye drugs | k… | 109 | 8 |
| ENT drugs | l… | 71 | 10 |
| Skin drugs | m… | 190 | 32 |
| Immunology drugs | n… | 35 | 6 |
| Anesthetic drugs | o… | 31 | 2 |
| Total | 2,023 | 205 |
Abbreviations: ENT = ear, nose, and throat; OBS/GYN/UTI = obstetrics, gynecologic and urinary tract infection; SAIL = Secure Anonymised Information Linkage.
a
Prescribed for at least 2% of patients within the case-control cohort.