Change in demand for blood counts at Royal Derby Hospital (intervention institution) compared to Nottingham University Hospitals (control institution) after the informational feedback intervention was implemented. A dummy variable for winter months and for the Christmas week was also included in the model. Only statistically significant variables are included in the parsimonious models.
| Rate ratio (95% CI) for FBC | Rate ratio (95% CI) for LFTs | Rate ratio (95% CI) for U&E | |
|---|---|---|---|
| Pre-intervention difference between hospitals (RDH versus NUH) | 0.69 (0.67, 0.72)p<0.001 | 0.63 (0.60, 0.67)p<0.001 | 0.65 (0.62, 0.68)p<0.001 |
| Pre-intervention slope for the control NUH hospital (per week) | 1.0004 (1.0002, 1.0006)p=0.002 | 1.001 (1.000, 1.002)p=0.001 | NS |
| Pre-intervention difference in slope between hospitals | NS | 0.998 (0.997, 0.998)p<0.001 | NS |
| Change in level post intervention for the control NUH hospital | NS | NS | 1.03 (1.02, 1.05)p<0.001 |
| Change in slope post intervention for the control NUH hospital | NS | 0.999 (0.998, 1.000)P=0.014 | NS |
| Difference in the change in level between hospitals | 0.97 (0.95, 0.99)p<0.001 | NS | 0.98 (0.96, 1.00)p=0.054 |
| Difference in the change in slope between hospitals | NS | NS | NS |
CI = confidence intervals; FBC = full blood count; LFTs = liver function tests; NUH = Nottingham University Hospitals; NS = variables were not significant and were not included in the final model; RDH = Royal Derby Hospital; U&E = urea and electrolytes.