Assertion: narcotic's use | /r/HasProperty | 30-day prevalence
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text: In total, 4.9% of adolescents between 12 and 17 years old had also used an illegal drug within the 12 month period prior to the survey (12-month prevalence), while less than half of them (2.0%) reported that this use was less than 30 days previously (30-day prevalence).