Types of errors

Proportion of prescriptions with each error type before CPOE implementation (%)

Proportion of prescriptions with each error type after CPOE implementation (%)

Distribution used (PSA)

Clinical

Contraindication for patients ≥ 65 years

0.5

0.2

Lognormal

Drug allergy

0.2

0

Lognormal

Drug-disease interaction

0.5

0.2

Lognormal

Drug-drug interaction

0.5

0.3

Lognormal

Lack of appropriate laboratory monitoring

2.0

2.1

Lognormal

Therapeutic duplication

0.3

0.3

Lognormal

Wrong directions

2.4

1.6

Lognormal

Wrong dosage form

0.1

0.1

Lognormal

Wrong dose

0.2

0.2

Lognormal

Wrong drug

0.3

0.2

Lognormal

Wrong route

0

0

Lognormal

Wrong strength

0.3

0.1

Lognormal

Total proportion of prescriptions with clinical errors

7.3

5.3

Administrative

Illegible writing

2.0

0

Lognormal

Inappropriate abbreviations

4.8

0.4

Lognormal

Missing information

3.8

2.5

Lognormal

Wrong patient

0.1

0

Lognormal

Wrong physician

0.1

0

Lognormal

Total proportion of prescriptions with administrative errors

10.8

2.9

Total proportion of prescriptions with any type of error

18.2

8.2