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We are trying conducting a lifestyle intervention in which we are trying to determine whether the intervention group are exercising more than the control group after 6 months of the intervention. We have calculated the difference in the proportion doing exercise more than 3 times a week between baseline and 6 months in the control group and in the intervention group. Can anyone help me with determining the CI on the difference in the difference in proportions? many thanks John %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%