The Influence that Electronic Prescribing Has on Medication Errors and Preventable Adverse Drug Events: an Interrupted Time-series Study

Table 2

Descriptives of the Study Population

	Study Period			Hospital
	Pre	Post	pValue*	UMCG	Twee-Steden Hospital	pValue*
Age (mean ± SD)	65.5 ± 19.2	65.1 ± 19.1	0.74	58.2 ± 19.1	73.0 ± 16.0	< 0.001
Female (%)	54.7	56.6	0.53	55.7%	55.6%	0.96
MOs per hospital stay (mean ± SD)	12.3 ± 7.8	11.7 ± 8.7	0.21	11.1 ± 8.4	13.0 ± 8.1	< 0.001
Patients (n)			0.04			NA†
Internal medicine	251	235		200	286
Geriatrics	153	135		—	288
Gastroenterology/rheumatology	188	233		421	—
Total	592	603		621	574

MO = month; NA = not appropriate; SD = standard deviation; UMCG = University Medical Center Groningen, Groningen, The Netherlands.
↵* Continuous variables are analyzed with a t test and categorical with a χ² test.
↵† NA not appropriate: clearly the distribution per ward was different across the hospital as different wards were included.

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