Table 2 shows the distribution of the alcohol and cannabis variables for the NTR target sample. About 3.5% of the sample never initiated alcohol use and those subjects were excluded for age at regular drinking. From the subjects who ever tried alcohol, 22.6% never started to drink regularly and more than half of the subjects (58.7%) started regular drinking after the age of 17. Almost 9% reported to drink more than 20 glasses alcohol per week. In the total sample, 85% never tried cannabis. Most of the subjects who tried cannabis started at 18 years or older.
