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Table 1 Number of participants in the Youth in Iceland surveys, 1995–2006.

From: Trends in prevalence of substance use among Icelandic adolescents, 1995–2006

Year N % of population % males
1995 3,814 86 51
1997 3,912 90 51
1998 3,723 89 52
1999 3,549 87 50
2000 3,220 82 49
2001 3,069 79 47
2002 3,226 78 50
2003 1,699 37 52
2004 3,805 85 52
2005 3,713 78 50
2006 3,670 82 50
  1. Note. In 2003 the Icelandic survey became the local part of the international ESPAD study. This study used a questionnaire too large to implement in full size in class-room setting among 9th and 10th graders. The survey was divided into two parts (A and B), using separate questionnaires. Participants were randomly selected for these two groups. Both questionnaires included measures on substance use but only part A had items referring to illegal use such as hashish and amphetamines. The A part is utilized in this analysis.