Clinical effects of accreditation in general practice: a pragmatic randomized controlled study.

In this first randomized study exploring the effects of accreditation in a primary care context, accreditation was found to reduce the number of redeemed medications and polypharmacy. We conclude that accreditation can be effective in changing behaviour, but the identified effects are small and limited to certain outcomes. Evaluations on the cost-effectiveness of accreditation are therefore warranted.