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signature.year (in Demographics)

Variable Summary Undergrad Freshman Sophomore Junior Senior
Sexually active students: Undergrad Freshman Sophomore Junior Senior
Casual-sexually active students: Undergrad Freshman Sophomore Junior Senior

students (signature_year)
 All RsFemaleMale
Mean (Std. Dev.) 2007.90 (1.68) 2008.03 (1.69) 2007.62 (1.62)
0 0 0.00% 0 0.00% 0 0.00%
2005 15 1.17% 12 1.36% 3 0.76%
2006 321 25.08% 205 23.30% 114 28.72%
2007 291 22.73% 167 18.98% 124 31.23%
2008 176 13.75% 129 14.66% 47 11.84%
2009 252 19.69% 201 22.84% 51 12.85%
2010 72 5.62% 56 6.36% 16 4.03%
2011 153 11.95% 110 12.50% 42 10.58%
Missing 471
(26.90%)
339
(27.81%)
132
(24.95%)
Total 1751 100% 1219 100% 529 100%

These tables reflect only undergraduates attending 4-year colleges who are of normative age -- 18, 19, 20, 21, or 22, +/- 1, for freshman, sophomores, juniors, and seniors, respectively.