| http://www.w3.org/ns/prov#value | - - National Survey in the School Environment), carried out in 2006 in secondary education. g The differences in the age groups evaluated in the different studies may justify these discrepancies and allow understanding the similarity of our results to those of ESPAD. One year can represent a huge change in the number of adolescents who consume drugs, since adolescence is a period of great changes.
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