Skolelevers drogvanor - 2009, gymnasiets år 2

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持续开展全国性药物使用习惯调查（national drug habit survey）。自2004年起，还面向……二年级学生开展年度调查。