signature.year

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 Rs Female Male

Mean (Std. Dev.) 2007.19 (34.68) 2007.26 (33.84) 2007.01 (36.73)

0 3 0.03% 2 0.03% 1 0.03%

2005 117 1.16% 82 1.16% 35 1.17%

2006 2175 21.59% 1490 21.12% 681 22.75%

2007 3183 31.60% 2104 29.82% 1069 35.72%

2008 1311 13.01% 979 13.87% 331 11.06%

2009 1740 17.27% 1304 18.48% 433 14.47%

2010 655 6.50% 459 6.51% 194 6.48%

2011 890 8.83% 636 9.01% 249 8.32%

Missing 3298
(24.66%) – 2391
(25.31%) – 902
(23.16%) –

Total 13372 100% 9447 100% 3895 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.

students (signature_year)
	All Rs		Female		Male
Mean (Std. Dev.)	2007.19 (34.68)		2007.26 (33.84)		2007.01 (36.73)
0	3	0.03%	2	0.03%	1	0.03%
2005	117	1.16%	82	1.16%	35	1.17%
2006	2175	21.59%	1490	21.12%	681	22.75%
2007	3183	31.60%	2104	29.82%	1069	35.72%
2008	1311	13.01%	979	13.87%	331	11.06%
2009	1740	17.27%	1304	18.48%	433	14.47%
2010	655	6.50%	459	6.51%	194	6.48%
2011	890	8.83%	636	9.01%	249	8.32%
Missing	3298 (24.66%)	–	2391 (25.31%)	–	902 (23.16%)	–
Total	13372	100%	9447	100%	3895	100%