Skolelevers drogvanor - 1972, årskurs 9

Since 1971, a national drug habit survey has been conducted among Swedish ninth graders. From 2004, annual survey are also being conducted among students in the second year of...自1971年起，瑞典便持续针对九年级学生开展全国性药物使用习惯调查。自2004年起，项目组亦面向……二年级学生开展年度调查。