To screen items and define boundary value for problem gamblers’judgment criterion,by Delphi Method,the feedback data of 23 experts were statistically analyzed in terms of authority,concentricity and coordination.A total sample of 2 426 lottery consumers was assessed.The conclusions show that by Delphi Method and item discrimination method,the problem gamblers’judgment criterion consists of 12 items and 5 factors(continued and repeated purchasing behavior,cognitive bias,loss of control,abstinence,actus reus).2) By sensitivity,specificity an...