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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.) 2007.95 (1.69) 2008.05 (1.70) 2007.74 (1.66)
0 0 0.00% 0 0.00% 0 0.00%
2005 16 1.20% 13 1.46% 3 0.67%
2006 323 24.14% 205 23.03% 118 26.52%
2007 315 23.54% 172 19.33% 141 31.69%
2008 154 11.51% 118 13.26% 36 8.09%
2009 279 20.85% 210 23.60% 69 15.51%
2010 89 6.65% 57 6.40% 32 7.19%
2011 162 12.11% 115 12.92% 46 10.34%
Missing 540
(28.75%)
372
(29.48%)
167
(27.29%)
Total 1878 100% 1262 100% 612 100%

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.