Skolelevers drogvanor - 2014, 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，瑞典针对九年级学生开展了一项全国性的药物使用习惯调查（national drug habit survey）。自2004年起，还每年针对……二年级的学生开展年度调查。