Pre-intervention | Post-intervention | RRR (%) | ARR (%) | Statistical analysis OR | |

Patients | 730^{†} | 751* | – | – | – |

Number of orders written for all patients | 9772* | 10 352* | – | – | – |

Number of medication orders per patient | 12 (0–60)^{†} | 12 (0–70)^{†} | – | – | – |

Prescribing errors | |||||

All prescribing errors identified (% of orders) | 2300 | 1935 | – | – | – |

Number of patients with ⩾1 errors (% of patients) | 591 (81.0%)* | 587 (78.1%)* | 3.5 | 2.9 | χ^{2} test, p = 0.182 |

Prescribing errors per patient | 2 (0–20)^{†} | 2 (0–17)^{†} | Mann–Whitney U test, p = 0.021 | ||

Percentage of errors per order per patient^{‡} | 20.0% (0–250%)^{†} | 15.8% (0–180%)^{†} | 21.0 | 4.2 | Mann–Whitney U test, p = 0.03 |

ARR, absolute risk reduction; OR, odds ratio; RRR, relative risk reduction.

*Number (percentage).

^{†}Median (range).^{‡}Calculated from total number of errors per patient divided by total number of orders multiplied by 100.