Casual Contraception in Casual Sex
Supplemental Figures & Tables

Supplemental Figure S1. Predicted Probabilities of Condom Use as Students Progress Through College, by Mother's Educational Attainment, for All Events and for Events in which the Partner Attended the Respondent's College
Supplemental Table S1. Selected Odds Ratios for Women's Odds of Coitus
All EventsSame-School Events
*** p < .001 ** p < .01 * p < .05 ^ p < .1
Year of College
Freshman Year
Sophomore Year1.061.10
Junior Year1.25*1.32*
Senior Year1.52***1.56**
Mother's Educational Attainment
Mother Received a High School Education or Less
Mother Received Some College Education0.85*0.89
Mother Received a Bachelor's Degree0.80**0.87
Mother Received a Graduate Degree0.84*0.89
School Gender Composition
≤ 53% Female
≥ 53% Female0.921.17
≥ 53% Female × Sophomore1.39*1.24
≥ 53% Female × Junior1.81***1.69**
≥ 53% Female × Senior1.71***1.57*
Observations71444294
Supplemental Table S2. Selected Odds Ratios for the Odds of Condom Use, Pooling the Sexes
All EventsSame-School Events
*** p < .001 ** p < .01 * p < .05 ^ p < .1
Year of College
Freshman Year
Sophomore Year0.40***0.27***
Junior Year0.56*0.38*
Senior Year0.46***0.29***
Mother's Educational Attainment
Mother Received a High School Education or Less
Mother Received Some College Education0.750.45*
Mother Received a Bachelor's Degree0.72^0.42*
Mother Received a Graduate Degree0.48***0.27***
Year of College × Mother's Educational Attainment
Sophomore × Some College1.76^2.19^
Junior × Some College1.202.04
Senior × Some College1.061.75
Sophomore × Bachelor's Degree1.71^2.22^
Junior × Bachelor's Degree1.111.45
Senior × Bachelor's Degree1.331.98
Sophomore × Graduate Degree2.57**3.39**
Junior × Graduate Degree1.652.58^
Senior × Graduate Degree2.42**3.49**
Observations38342159