Skolelevers drogvanor - 2008, 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，一项全国药物使用习惯调查便针对瑞典九年级学生持续开展。自2004年起，同步针对……二年级学生开展年度调查。