Incidence rate and residual risk of transfusion-transmitted HCV infection
| Period | No. of donations | Total person-years | No. of incident cases | Incidence rate per 1,000,000 person-year (95% CI) | Residual risk per 1,000,000 person-year (95% CI) | |
|---|---|---|---|---|---|---|
| Donors who donated only once during the period | 2012.07.01∼ 2014.06.30 | 1,355,447 | 2,710,740 | 154 | 56.81 (48.51∼66.53) | 1.56 (1.33∼1.82) |
| 2014.07.01∼ 2016.06.30 | 1,282,965 | 2,565,804 | 126 | 49.11 (41.24∼58.48) | 1.35 (1.13∼1.60) | |
| 2016.07.01∼ 2018.06.30 | 1,148,487 | 2,296,873 | 101 | 43.97 (36.18∼53.44) | 1.20 (0.99∼1.46) | |
| Donors who donated more than once during the period | 2012.07.01∼ 2014.06.30 | 4,008,392 | 8,016,775 | 9 | 1.12 (0.58∼2.16) | 0.03 (0.02∼0.06) |
| 2014.07.01∼ 2016.06.30 | 4,353,245 | 8,706,482 | 8 | 0.92 (0.46∼1.84) | 0.03 (0.01∼0.05) | |
| 2016.07.01∼ 2018.06.30 | 4,239,200 | 8,478,393 | 7 | 0.83 (0.39∼1.73) | 0.02 (0.01∼0.05) | |
| Total | 2012.07.01∼ 2014.06.30 | 5,363,839 | 10,727,515 | 163 | 15.19 (13.03∼17.72) | 0.42 (0.36∼0.49) |
| 2014.07.01∼ 2016.06.30 | 5,636,210 | 11,272,286 | 134 | 11.89 (10.04∼14.08) | 0.33 (0.27∼0.39) | |
| 2016.07.01∼ 2018.06.30 | 5,387,687 | 10,775,266 | 108 | 10.02 (8.3∼12.1) | 0.27 (0.23∼0.33) |