Summary of the opportunities for an error occurring and high-risk errors that occurred in the three hospitals
| Site | Pre-CPOE | Post-CPOE | P value | |||||||
| Patient records | NOpp | NErr | Error rate (%) | Patient records | NOpp | NErr | Error rate (%) | Relative risk (95% CI) | ||
| 1 | 365 | 3867 | 167 | 4.3 | 297 | 2634 | 74 | 2.8 | 0.65 (0.49 to 0.86) | 0.002 |
| 2 | 615 | 4513 | 179 | 4.0 | 581 | 4527 | 200 | 4.4 | 1.11 (0.91 to 1.36) | 0.294 |
| 3 | 264 | 2932 | 216 | 7.4 | 300 | 2665 | 116 | 4.4 | 0.59 (0.47 to 0.74) | <0.001 |
| Total | 1244 | 11 312 | 562 | 5.0 | 1178 | 9826 | 390 | 4.0 | 0.80 (0.70 to 0.91) | <0.001 |
NOpp represents the number of error opportunities generated, while NErr is the number of errors that were found to have occurred. P values are from Fisher’s exact tests, with bold values significant at P<0.05.
CPOE, computerised physician order entry.