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Interviews with Vapers: Implications for Future Research With Electronic Cigarettes. Nicotine and Tobacco Research : 13(9):860-867

While the proportion who gave no positive user characteristic ranged from 34.5 to 60.1 per cent among boys, and 40.1 to 79.2 per cent among girls, the corresponding proportions who gave one positive characteristic ranged from 16.4-47.2 per cent and 11.1-19.8 per cent for boys and girls respectively

We used the chi-squared test for the categorical variables, which are presented as frequencies and percentages