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Variation in prescribing, as measured by HHI, corrected for EMS, type of practice, dispensing practice, number of GPs in a practice, number of different drugs advised in the DSS (full model in appendix 4)
| HHI (st. error) | Difference | |
| DSS daily users | 40.3 (1.2) | |
| DSS non users/havers | 41.4 (1.3) | 1.1 (p = 0.3) |
