Notes:
In 1995, surveys in countries marked with an asterisk were not strictly comparable with the ESPAD surveys. Spain did not participate in the ESPAD survey. The data included here are based on a Spanish survey series in 1996, 1998 and 2002. Drug prevalence questions may be considered comparable to the ESPAD questions, but other aspects of the method mean that the Spanish data are not strictly comparable.
Source:
Hibell et al., 2004