These numbers were on the title card at the very end of the last episode.
243 addicts were filmed.
238 went to treatment.
156 are sober today.
That means 64% of addicts on the show were sober as of July 2013.
17 addicts (that we know of) have died since their intervention, as of Jan 2015.
16 of those 17 addicts went to treatment (Sean did not).
The 5 who did not go to treatment: Alissa, Marquel, Larry, Adam, Sean.