Sample size
In the previous follow‐up telephone‐based genetic counseling intervention by Kinney and colleagues, uptake of colonoscopy was 15% in the usual care group and 35% in the intervention group. Since uptake of RRSO was not expected to be as high as colonoscopy (which is a screening intervention rather than a prophylactic surgical intervention), we based our sample size calculation on the ability to detect a slightly smaller difference of approximately 15%. Sample sizes of 121 in the intervention arm and 121 in the usual care arm were required to detect this difference with 80% power, using a two‐sided 