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. 2016 Dec 19;17:41. doi: 10.1186/s40510-016-0154-9

Table 1.

Descriptive statistics (ratio males/females and mean age) of the groups control, text message, and phone call

Control Text message Phone call
(N = 30) (N = 28) (N = 26)
Ratio male to female 15:15 12:16 16:10
Age
 Mean (SD), years 13.5 (1.7) 12.8 (1.5) 13.6 (1.7)
 Range, years 10 to 18 10 to 16 11 to 17