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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.) 2007.86 (1.67) 2007.97 (1.68) 2007.61 (1.61)
0 0 0.00% 0 0.00% 0 0.00%
2005 21 1.15% 16 1.25% 5 0.92%
2006 469 25.66% 311 24.33% 156 28.62%
2007 435 23.80% 263 20.58% 170 31.19%
2008 245 13.40% 182 14.24% 63 11.56%
2009 351 19.20% 279 21.83% 72 13.21%
2010 96 5.25% 71 5.56% 25 4.59%
2011 211 11.54% 156 12.21% 54 9.91%
Missing 694
(27.52%)
530
(29.31%)
163
(23.02%)
Total 2522 100% 1808 100% 708 100%

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.