No, that answer didn't help me at all. Since there is no indication of how many of the 14 clients graduated for over four years were still sober after four years, there was no figure from which you derived those probabilities. The only figure indicating a probability of still being sober after 4 years was the 48% of the sample group reporting continuous sobriety. Since 93.1% of those graduated one year or less, or 26 clients, reported being sober for 12 months or more, that leaves only 12 clients, or 12%, who are still continuously sober since graduation. That's only 12 out of 59 clients graduated for one year or more. There is a very curious detail in the table. Now those figures were derived from the table indicating the longest period of sobriety, which grouped grads with a time since of graduation of up to two years into the group "one year or less". There are no figures that indicate total length of continuous sobriety since graduation, other than the 48% of the total sample of 100.
The mean time since graduation for the sample was 2 years and 3 months. Thus, probablities of grads still living a clean and sober life after 2 years and 3 months could be calculated.
Here is an interesting statement from the study:
"If it was projected the 15 clients not available for interview were not abstinent, then the result for the entire population of 100 would result in an abstinent rate of 85% at the time of interview."
According to this, if all 15 non-respondent grads were not abstinent, 85%, or the entire 85 responding population, were abstinent. Since only 48% of the sample reported being continuously sober, what is the significance of this?
So back to my question. Since the study used only 14 people graduated more than 4 years, from a sample of 100 grads with a mean time since graduation of 2 years 3 months, with a reported 48% rate of continuous sobriety, how does this show that 85% of all grads are living a clean and sober life 4 years after graduation?