| Predictor | ORunadjusted (95% CI) | ORadjusted* (95% CI) |
| No. of dosing errors | 1.16 (1.09 to 1.23) | 1.05 (0.92 to 1.21) |
| No. of therapeutic errors | 2.22 (1.77 to 2.78) | 1.98 (1.53 to 2.56) |
| No. of transcription errors | 1.19 (1.12 to 1.26) | 1.12 (1.01 to 1.25) |
| Age | ||
| Lowest to 34 | 0.27 (0.06 to 1.14) | |
| 35 to 49 | 0.51 (0.21 to 1.23) | |
| 50 to 64 | 0.55 (0.27 to 1.11) | |
| 65 to 79 | 1.26 (0.75 to 2.10) | |
| 80 to highest | 2.00 (1.22 to 3.25) | 1.63 (0.92 to 2.90) |
| Gender (male is reference) | 0.88 (0.54 to 1.42) | |
| No. of medication errors | 1.07 (1.05 to 1.10) | 0.98 (0.90 to 1.05) |
| No. of medication orders | 1.07 (1.04 to 1.09) | 1.00 (0.96 to 1.05) |
| Therapeutic area (ATC code) | ||
| A10 (antidiabetics) | 2.24 (1.23 to 4.08) | 1.50 (0.73 to 3.09) |
| B01 (anticoagulants) | 1.35 (0.83 to 2.17) | |
| B03 (drugs for anaemia) | 2.39 (1.29 to 4.42) | 1.79 (0.86 to 3.71) |
| H02 (corticosteroids | 1.34 (0.76 to 2.37) | |
| J01 (antibiotics for systemic use) | 2.99 (1.83 to 4.87) | 1.48 (0.82 to 2.68) |
| M01 (anti-inflammatory drugs) | 1.00 (0.47 to 2.12) | |
| N02 (analgesics) | 2.07 (1.27 to 3.38) | 1.30 (0.72 to 2.32) |
| N03 (antiepileptics) | 1.11 (0.37 to 3.31) | |
| N05 (psycholeptics) | 2.16 (1.33 to 3.50) | 1.44 (0.80 to 2.58) |
| M04 (drugs for gout) | 2.21 (0.57 to 8.52) |
Significant values are shown in bold. *Adjusted for the confounding factors, which contributed significantly to the model.