Unfortunately Who, you've made a grave error in stating that graduates have a 48% chance of living a continuously sober life past 4 years, based on the results of the study. The average time since graduation for the sample was 2 years 3 months, not 4 years. For the sake of argument, accepting your claim that 93% of grads are continuously sober for one year from the time of graduation, the proportion of grads continuously sober after an average time since gradation of 2 years 3 months had declined to 48%. Nothing whatsoever included in the study about living a continuously sober life after 4 years. Again, the only information in the study pertaining specifically to those grads in the study who were graduated 4 years or more is the fact that 85.7% of them had maintained one year or more of continuous sobriety some time since their graduation. The first fact that you stated may or may not be true. The fact that most of the individuals in the respondent 85% of the sample were included in the second and third groups of table 2, and both of these groups had a propotion of individuals whose longest period of continuous sobriety since graduation was under 93.1%, the probability of your first statement being true is dubious. Your second statement may be true, but is not corroborated by any evidence whatsoever from the study. Your third statement cannot be proven with data from the study, as the length of time since graduation varies greatly from eight months to over 5 years, with an average of 2 years 3 months. Who, responses like this from you are what makes this fun. It's entertaining to speculate as to whether you're stupid but arrogant, or an extremely clever deviant. Either way, I do hope that you'll carry on!