We randomized 765 young adult ED patients who screened positive for past hazardous alcohol use to one of 3 groups : SMS assessments + feedback ( SA+F ) intervention who were asked to respond to drinking-related queries and received real-time feedback through SMS each Thursday and Sunday for 12 weeks ( n = 384 ) , SMS assessments ( SA ) who were asked to respond to alcohol consumption queries each Sunday but did not receive any feedback ( N = 196 ) , and a control group who did not participate in any SMS ( n = 185 ) .