6 For studies with more than one treatment arm, we took different approaches depending on the similarity of the interventions. For similar interventions (e.g., 2 arms of a lifestyle intervention, one using phone contact and one using inperson support) we pooled the data to do a pairwise comparison with the control group. Alternatively, if groups were substantially different (e.g., low-calorie diet and high-intensity aerobic exercise) we included the data for each arm compared with the control group but split the sample size for the control group to avoid a unit-of-analysis error and double counting.14