Send a thank-you note to everyone concerned, and appreciate meeting with them.
We acknowledge the fact that life after the interview is very restless, but then do not keep bugging the officials about the results. However, you can visit the various discussion forums and acquire knowledge about the progress and status of other schools and programs. If it may so transpire that fewer students have received the confirmation mail, and you haven’t, send a gentle reminder (an e-mail) to the application committee, citing the reason and asking them if they have arrived at a decision.