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Why do practices sometimes have more than one evidence rating, but programs only have one?

Sometimes a practice on will receive multiple evidence ratings because there is sufficient evidence available to draw conclusions about multiple outcomes addressed by that practice. This is because the ratings for practices are based on a larger amount of evidence using techniques of meta-analysis to examine the findings of numerous studies. With more evidence, it is possible to draw conclusions at a more detailed level of analysis. Programs on receive a single overall evidence rating because they are often based on only one evaluation study (although up to three may be included). With a smaller evidence base to inform conclusions, does not provide outcome-level ratings for programs.