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signature.day (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_day)
 All RsFemaleMale
Mean (Std. Dev.) 13.88 (8.58) 14.23 (8.62) 13.02 (8.39)
0 3 0.02% 2 0.02% 1 0.03%
1 659 5.03% 463 4.98% 195 5.15%
2 647 4.94% 417 4.49% 223 5.89%
3 555 4.24% 370 3.98% 183 4.83%
4 546 4.17% 362 3.90% 184 4.86%
5 387 2.95% 282 3.04% 105 2.77%
6 373 2.85% 258 2.78% 114 3.01%
7 357 2.72% 245 2.64% 111 2.93%
8 446 3.40% 310 3.34% 134 3.54%
9 866 6.61% 595 6.41% 269 7.10%
10 617 4.71% 422 4.54% 195 5.15%
11 444 3.39% 289 3.11% 155 4.09%
12 377 2.88% 246 2.65% 131 3.46%
13 507 3.87% 340 3.66% 164 4.33%
14 401 3.06% 286 3.08% 115 3.04%
15 425 3.24% 304 3.27% 120 3.17%
16 391 2.98% 268 2.89% 123 3.25%
17 449 3.43% 353 3.80% 96 2.53%
18 436 3.33% 329 3.54% 106 2.80%
19 602 4.59% 435 4.68% 165 4.36%
20 384 2.93% 288 3.10% 95 2.51%
21 318 2.43% 236 2.54% 82 2.17%
22 306 2.33% 234 2.52% 71 1.87%
23 318 2.43% 228 2.45% 89 2.35%
24 241 1.84% 179 1.93% 61 1.61%
25 345 2.63% 264 2.84% 80 2.11%
26 373 2.85% 281 3.03% 91 2.40%
27 346 2.64% 255 2.75% 91 2.40%
28 287 2.19% 230 2.48% 57 1.51%
29 263 2.01% 183 1.97% 79 2.09%
30 353 2.69% 268 2.89% 85 2.24%
31 83 0.63% 66 0.71% 17 0.45%
Missing 267
(2.00%)
159
(1.68%)
108
(2.77%)
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.