A multicentre, double-blind, randomised, controlled, parallel-group study of the effectiveness of a pharmacist-acquired medication history in an emergency department

Table 4 Discrepancy type and potential severity

Type of discrepancy	No.	Class 1^a	Class 2^b	Class 3^c
Incorrect or omitted dose	165	39 (23.6)	32 (19.4)	94 (57.0)
Therapeutic duplication	5	4 (80.0)	0 (0.00)	1 (20.0)
Incorrect or omitted frequency	6	0 (0.00)	4 (66.7)	2 (33.3)
Slow to restart drug therapy	156	28 (18.0)	103 (66.0)	25 (16.0)
No indication	2	0 (0.00)	2 (100)	0 (0.00)
Drug omission	447	190 (43.0)	187 (42.0)	70 (15.0)
Too soon to restart drug therapy	26	10 (38.0)	14 (54.0)	2 (8.0)
Inappropriate or omitted route	4	0 (0.00)	4 (100)	0 (0.00)
Total	811	271 (33.4)	346 (42.7)	194 (23.9)

^aClass 1: discrepancies unlikely to cause patient discomfort or clinical deterioration.
^bClass 2 discrepancies which could cause moderate discomfort or clinical deterioration.
^cClass 3 discrepancies potentially resulting in severe discomfort or clinical deterioration.

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