Table 4.

Medication error types in potential preventable ADEs pre-EHR and post-implementation

STAGES	ERROR TYPES	Pre-EHR		Post-implementation		p-value~
ORDERING	Order overdose	72	5%	77	8%	0.283
	Order underdose	37	3%	41	4%	0.772
	Omitted information	96	7%	19	2%	**
	Order wrong patient	5	0%	4	0%	1.000
	Order wrong drug	20	2%	49	5%	**
	Order, allergy	10	1%	13	1%	0.991
	Order, drug-drug interaction	1	0%	2	0%	1.000
	Error prone abbreviation	41	3%	0	0%	**
	Illegible order	16	1%	0	0%	*
	Order wrong start or stop times	5	0%	58	6%	**
	Duplicate orders	26	2%	107	11%	**
	Failure to renew order	15	1%	0	0%	*
	Inappropriate or wrong information	55	4%	105	11%	**
	Order-other	11	1%	17	2%	0.704
TRANSCRIPTION	Transcription	84	6%	0	0%	**
PREPARATION	Preparation	3	0%	2	0%	1.000
DISPENSING	Not dispensed or dispensed late	300	23%	96	10%	**
	Dispensing-other	8	1%	6	1%	1.000
ADMINISTRATION	Admin overdose	9	1%	2	0%	0.967
	Admin underdose	3	0%	2	0%	1.000
	Admin wrong patient	1	0%	1	0%	1.000
	Admin wrong drug	1	0%	1	0%	1.000
	Omitted administrations	105	8%	132	14%	**
	Late administrations	363	27%	162	17%	**
	Incorrect documentation	19	1%	32	3%	0.094
	Admin, no order	7	1%	8	1%	1.000
	Admin, allergy	3	0%	0	0%	0.988
	Admin, other	8	1%	10	1%	1.000
MONITORING	Monitoring	9	1%	11	1%	0.999
	TOTAL ERRORS	1,333	100%	957	100%	-

^~p-values of proportional difference tests are adjusted using the Sidak correction to account for multiple comparisons (29 tests).

Bold indicates pre-post differences that are statistically significant at the p<0.05 (*) or p<0.01 (**) levels.