Maryland's rate of problem gamblers ranks relatively high when compared to results in a handful of other states that had used the same survey. It trails only California, with 3.7 percent, and Nevada, with 5.1 percent. Tom Cargiulo, director of the Maryland Alcohol and Drug Abuse Administration, says the survey shows that there is a core group of troubled gamblers in the state who need programs that can help them identify and control their behavior. The General Assembly, in approving casinos in the state, set up provisions to funnel some of the income from slots into such programs. The survey of about 6,000 residents, conducted by telephone in September and October of last year, was a first step in this effort.