Casual Contraception in Casual Sex
Appendix Tables

Appendix Table A1. Selected Odds Ratios from Equation 2, Modified to Adjust for the Number of Times the Student Previously Hooked Up with this Partner
Models Estimating the Odds of Coitus Models Estimating the Odds of Condom Use
All Events Same-School Not-Same-School Coital Events Same-School Not-Same-School
WomenMenWomenMenWomenMenWomenMenWomenMenWomenMen
*** p < .001 ** p < .01 * p < .05 ^ p < .1
Year of College
Freshman Year
Sophomore Year1.29***1.33**1.19^1.36*1.31*1.120.67**0.64*0.54***0.64^0.850.67
Junior Year1.76***1.36**1.54***1.40*1.80***1.280.72**0.66*0.70*0.670.800.63
Senior Year1.95***2.03***1.69***1.86***1.98***2.32***0.65***0.63*0.62**0.55*0.75^0.78
Prior Hookups With This Partner
No Prior Hookups
1-2 Prior Hookups1.57***1.45***1.54***1.35*1.64***1.46*1.131.75*0.911.621.332.46*
3-5 Prior Hookups2.22***2.34***2.40***2.55***2.04***2.02**1.021.430.881.191.052.07^
≥ 6 Prior Hookups4.83***3.82***4.97***3.31***4.59***4.69***0.58***0.46***0.46***0.45***0.66**0.53*
Observations714431314294210727789672582125213757841199448
Appendix Table A2. Selected Odds Ratios from Equation 2, Modified to Adjust for the Student's Age at First Intercourse
Models Estimating the Odds of Coitus Models Estimating the Odds of Condom Use
All Events Same-School Not-Same-School Coital Events Same-School Not-Same-School
WomenMenWomenMenWomenMenWomenMenWomenMenWomenMen
*** p < .001 ** p < .01 * p < .05 ^ p < .1
Year of College
Freshman Year
Sophomore Year1.23**1.48***1.141.53**1.32*1.280.65***0.61**0.53***0.59*0.830.68
Junior Year1.55***1.46**1.54***1.62**1.45**1.150.68**0.61*0.64*0.57*0.800.72
Senior Year1.71***2.11***1.60***2.07***1.75***2.26***0.59***0.58**0.56**0.48**0.69*0.84
Age At First Intercourse
15 Or Younger1.57***2.12***1.68***2.65***1.50**1.51^0.61***0.750.59**0.900.63*0.52^
16 Years Old1.16^1.71***1.081.92***1.29^1.340.860.67*0.900.940.880.45*
17 Years Old
18 Years Old0.931.080.941.250.890.811.040.921.060.951.070.88
19 Or Older0.58***0.72*0.53***0.820.65**0.51*1.101.181.151.511.050.91
Not Applicable0.02***0.07***0.02***0.10***0.02***0.03***1.000.694.070.960.440.36
Observations714431314294210727789672582125213757841199448
Appendix Table A3. Selected Odds Ratios from Equation 2, Modified to Adjust for the Student's Cumulative Number of Sexual Partners
Models Estimating the Odds of Coitus Models Estimating the Odds of Condom Use
All Events Same-School Not-Same-School Coital Events Same-School Not-Same-School
WomenMenWomenMenWomenMenWomenMenWomenMenWomenMen
*** p < .001 ** p < .01 * p < .05 ^ p < .1
Year of College
Freshman Year
Sophomore Year1.031.22^0.971.27^1.080.950.69**0.62**0.58**0.60^0.860.67
Junior Year1.23*1.081.24*1.221.090.750.74*0.63*0.71^0.59^0.820.75
Senior Year1.18*1.29*1.091.261.161.190.65***0.63*0.64*0.52*0.73^0.93
Cumulative Intercourse Partners
Zero to 1
2 to 36.11***4.14***6.58***4.80***5.88***3.56***1.021.261.040.951.041.39
4 or more14.37***10.62***16.14***11.93***13.64***10.96***0.871.070.720.931.021.03
Observations714431314294210727789672582125213757841199448