Abstract
Prevalence estimations of drug-related phenomena, including numbers of users, extent of consequences, and levels of consumption and expenditures, can provide information useful in assessing the scope of the problem, identifying patterns and trends in consumption, evaluating the effectiveness of intervention programs, and allocating resources. The authors summarize the policy needs for, the current status of, and recent developments in prevalence estimation, as described in the preceding articles. Implications raised in the collective work and specific recommendations to improve prevalence estimation in the service of policy are discussed.
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