Table 1: Socio-demographic characteristics of the participants.

Variable 2004 (%) 2008 (%) 2012 (%)
Gender
Male 62 62 57
Female 38 38 43
Race/Ethnicity
White 75 72 77
Black 15 17 15
Other 10 11 8
Academic Year
Freshman 33 35 32
Sophomore 26 27 27
Junior 23 23 25
Senior 19 15 16