The National Archives Prob 11 57

Use of illicit drugs among high-school students in Jamaica ...

71 girls; mean age, 15.5 years) and 133 grade-11 students (57 boys, 76 girls; mean age, 16.6 years) randomly selected from one rural and one urban high-school in Jamaica. The questionnaire was administered on two occasions separated by a 4-weekintervalinJanuary±February1995.Thetest± retest reliability coefficients obtained were in the