it varies - Stanford BMI post-interview rate is about 1 in 3 to 1 in 2, but apparently they are taking fewer students this year - heard about 4-5 compared to 9 last year, while still inviting the same number of students to interview. So the rate should be on the lower end this year. At other programs, the % is quite a bit higher - at least 50%, and pushing 70-80%