Table 41b. Age of onset for various substances and mixing alcohol with pills. Proportion answering 'at the age of 13 or younger' by gender. 2015. Percentages.

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a 'Without a doctor's prescription'.
b In order to 'get high'.
c Used by end of 8th grade, approximate age is 13 (amphetamines only, cocaine only, tranquillisers only).