Applied to 21. Invited to 19. Interviewed at 13. Matched #1.
I probably over did it. Early in the season I realized I would be fairly competitive, but didn't have that confidence until after a couple of interviews. Believe it or not, the 21 applications came after weeding out several others due to program structure, city, etc. In the end, I agree with the other posters that I could have done well with <10, but I really learned a lot from each interview, and it helped form my opinion of what I was looking for in a program. Plus, I grouped interviews, so it wasn't as bad as it sounds. Of course $ is an issue, so do your best to honestly assess programs ahead of time. Finally, peds is good in that it has a long interview season and offers multiple days per week as options. APPLY EARLY. Your application doesn't have to be complete to get invitations. REPLY EARLY. I was given my first choice of interview days at all 13 programs because I replied immediately.