Table 1.
Study population (first column; n = 25 521) and distribution of injecting drug users (IDUs) identified via record-linkage in each of the four data sources according to sex, birth cohort, health board of residence and calendar year period of HCV diagnosis. The sensitivity of IDU status on the HCV Diagnosis database is computed by considering the IDUs identified by aggregating all four data sources as the ‘gold standard’
| Covariate | All HCV diagnosed | HCV-diagnosed cases with IDU risk in the following data sources | Sensitivity | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| (a) HCV Diag | (b) HIV Test | (c) SDMD | (d) SMR01/Deaths | ||||||||
| n | % | n | % | n | % | n | % | n | % | % | |
| All | 25 521 | — | 14 836 | — | 9761 | — | 12 410 | — | 7625 | — | 79·0 |
| Sex | |||||||||||
| Female | 8177 | 32·0 | 4415 | 29·8 | 2524 | 25·9 | 3806 | 30·7 | 2361 | 31·0 | 77·5 |
| Male | 17 344 | 68·0 | 10 421 | 70·2 | 7237 | 74·1 | 8604 | 69·3 | 5264 | 69·0 | 79·6 |
| Birth cohort | |||||||||||
| <1960 | 5168 | 20·2 | 1530 | 10·3 | 889 | 9·1 | 790 | 6·4 | 771 | 10·1 | 78·1 |
| 1960–69 | 8894 | 34·8 | 5557 | 37·5 | 3637 | 37·3 | 4260 | 34·3 | 2843 | 37·3 | 81·2 |
| 1970–79 | 8812 | 34·5 | 6119 | 41·2 | 4148 | 42·5 | 5706 | 46·0 | 3170 | 41·6 | 78·6 |
| 1980+ | 2647 | 10·4 | 1630 | 11·0 | 1087 | 11·1 | 1654 | 13·3 | 841 | 11·0 | 74·0 |
| Health board | |||||||||||
| GGC | 10 679 | 41·8 | 6743 | 45·5 | 4090 | 41·9 | 5537 | 44·6 | 3045 | 39·9 | 82·5 |
| Other | 14 842 | 58·2 | 8093 | 54·5 | 5671 | 58·1 | 6873 | 55·4 | 4580 | 60·1 | 76·3 |
| Period of HCV diagnosis | |||||||||||
| <1995 | 2290 | 9·0 | 1014 | 6·8 | 686 | 7·0 | 585 | 4·7 | 584 | 7·7 | 83·7 |
| 1995–99 | 7163 | 28·1 | 4597 | 31·0 | 2993 | 30·7 | 3388 | 27·3 | 2329 | 30·5 | 84·3 |
| 2000–04 | 8168 | 32·0 | 5341 | 36·0 | 3518 | 36·0 | 4436 | 35·7 | 2642 | 34·6 | 82·4 |
| 2005–09 | 7900 | 31·0 | 3884 | 26·2 | 2564 | 26·3 | 4001 | 32·2 | 2070 | 27·1 | 68·9 |
HCV Diag, HCV Diagnosis database; SDMD, Scottish drug misuse database; SMR01/Deaths, Scottish Morbidity Records hospital discharge/deaths data; GGC, Greater Glasgow & Clyde Health Board.