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. Author manuscript; available in PMC: 2015 Jul 9.
Published in final edited form as: J Drug Issues. 2012 Oct 11;42(4):337–357. doi: 10.1177/0022042612461769

Table 1.

Characteristics of Study Participants (Across 10 Imputed Data Sets)

United States Netherlands
Age 12 – 15
(n = 10,107)
%		 Age 16 – 17
(n = 4,501)
%		 Age 12 – 15
(n = 14,979)
%		 Age 16 – 17
(n = 3,843)
%
Age
 12 29.6 16.1
 13 22.5 29.1
 14 29.0 29.2
 15 18.9 25.7
 16 60.4 66.2
 17 39.6 33.8
Mean Age 13.4 16.4 13.6 16.3
 (Std. Dev.) (1.1) (0.5) (1.0) (0.5)
Gender
 Boys 48.3 48.8 47.9 48.0
 Girls 51.7 51.2 52.1 52.0