Table 1. Classification of the suspected adverse reaction cases investigated by the trace back system in Korea, 2006-2014.
| Classification | N of annual reported case | Total (%) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | ||
| Related to transfusion | 4 | 2 | 1 | 3 | - | 1 | - | 1 | - | 12 (6.0) |
| Probably related to transfusion | - | - | - | - | - | - | - | 1 | - | 1 (0.5) |
| Probably not related to transfusion | - | - | - | - | - | 1 | 7 | 3 | 1 | 12 (6.0) |
| Not related to transfusion | 32 | 16 | 10 | 15 | 8 | 3 | 9 | 3 | 2 | 98 (49.2) |
| Unable to investigate | 17 | 11 | 7 | 9 | 11 | 6 | - | - | - | 61 (30.7) |
| Under investigation | - | - | - | - | - | - | 1 | 6 | 8 | 15 (7.5) |
| Subtotal | 53 | 29 | 18 | 27 | 19 | 11 | 17 | 14 | 11 | 199 |