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dates.since.started.college (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 (dates_since_started_college)
 All RsFemaleMale
Mean (Std. Dev.) 3.24 (4.86) 2.92 (4.38) 3.98 (5.77)
0 8163 40.55% 5817 41.51% 2333 38.44%
1 1986 9.87% 1489 10.63% 491 8.09%
2 2147 10.67% 1513 10.80% 628 10.35%
3 1655 8.22% 1197 8.54% 450 7.41%
4 1227 6.10% 874 6.24% 348 5.73%
5 1138 5.65% 775 5.53% 359 5.92%
6 670 3.33% 431 3.08% 237 3.91%
7 523 2.60% 349 2.49% 174 2.87%
8 414 2.06% 277 1.98% 137 2.26%
9 207 1.03% 139 0.99% 68 1.12%
10 435 2.16% 266 1.90% 168 2.77%
11 183 0.91% 118 0.84% 63 1.04%
12 170 0.84% 103 0.74% 67 1.10%
13 117 0.58% 70 0.50% 46 0.76%
14 89 0.44% 56 0.40% 33 0.54%
15 308 1.53% 178 1.27% 130 2.14%
16 83 0.41% 53 0.38% 30 0.49%
17 100 0.50% 62 0.44% 38 0.63%
18 85 0.42% 45 0.32% 40 0.66%
19 53 0.26% 26 0.19% 27 0.44%
20 114 0.57% 57 0.41% 56 0.92%
21 32 0.16% 16 0.11% 16 0.26%
22 42 0.21% 18 0.13% 24 0.40%
23 18 0.09% 10 0.07% 8 0.13%
24 3 0.01% 2 0.01% 1 0.02%
25 56 0.28% 33 0.24% 23 0.38%
26 1 0.00% 0 0.00% 1 0.02%
27 4 0.02% 1 0.01% 3 0.05%
28 1 0.00% 1 0.01% 0 0.00%
29 1 0.00% 1 0.01% 0 0.00%
30 106 0.53% 36 0.26% 70 1.15%
Missing 0
(0.00%)
0
(0.00%)
0
(0.00%)
Total 20131 100% 14013 100% 6069 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.