State substance abuse treatment gaps.

This study estimated the adequacy of state substance abuse treatment rates relative to treatment needs. The investigators created composite drug and alcohol treatment need indexes from explicit-mention mortality and substance-defined arrest rates. The indexes were reliable and had evidence of construct validity, but alternative population-at-risk and survey-based need measures did not fair as well.

Identifying substance abuse treatment gaps in substate areas.

Investigating concerns about uneven utilization of health services, especially affecting disadvantaged high-risk populations, the authors constructed composite indexes for identifying substance abuse treatment gaps in Rhode Island towns and multi-town planning areas. The Drug, Alcohol, and Substance Abuse Need Indexes combined multiple-year rates of substance-related deaths, hospital discharges, and arrests. These indicators were reliable and possessed convergent validity; the composite indexes were also reliable and had construct validity.