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. Author manuscript; available in PMC: 2014 Feb 28.
Published in final edited form as: BMJ Qual Saf. 2013 Sep 19;23(1):56–65. doi: 10.1136/bmjqs-2013-001828

Table 2.

Level of patient harm for medication error events and ADEs

EVENTS Level of potential or actual patient harm
No harm Significant Serious Life threatening Fatal Total
Potential ADEs ( Inline graphic) and medication errors with no potential for harm Single errors 470 (33%) 370 (26%) 421 (29%) 175 (12%) - 1436 (100%)
Group of errors 15 (19%) 18 (22%) 40(50%) 7 (9%) - 80 (100%)
Sequential errors 64 (36%) 45 (25%) 46(26%) 23 (13%) - 178 (100%)
Total 549 (32%) 433 (26%) 507(30%) 205 (12%) - 1694 (100%)
ADEs Preventable ADEs - 7 (18%) 13(34%) 18 (47%) 0 (0%) 38 (100%)
Non-preventable ADEs - 34 (46%) 29(40%) 10 (14%) 0 (0%) 73 (100%)
Total - 41 (37%) 42(38%) 28 (25%) 0 (0%) 111 (100%)
Total 549 (30%) 474 (26%) 549(30%) 233 (13%) 0 (0%) 1805 (100%)