Table 1. Selected Characteristics of Participants who completed the study compared to those lost to follow up^a.

	Non-completersb N = 364	Completers N = 319	p-valuec
Age (years)	24.1 ± 0.17	24.9 ± 0.19	0.003
Race
Asian	57 (15.7%)	46 (14.5%)	0.80
Black or African American	35 (9.6%)	26 (8.1%)
American Indian or Alaskan Native	3 (0.8%)	1 (0.3%)
White	252 (69.2%)	232 (72.7%)
Multi-race	17 (4.7%)	14 (4.4%)
Ethnicity
Hispanic	345 (94.8%)	304 (95.3%)	0.75
Non-Hispanic	19 (5.2%)	15 (4.7%)
Education
Less than high school	1 (0.3%)	1 (0.3%)	0.002
High school	10 (2.7%)	12 (3.8%)
Vocational training	7 (1.9%)	5 (1.6%)
Some college	150 (41%)	86 (27.1%)
College degree	129 (35.3%)	118 (37.2%)
Graduate or professional degree	68 (18.6%)	95 (30%)
Marital Status
Never married	301 (82.6%)	262 (82.1%)	0.92
Married	52 (14.3%)	47 (14.7%)
Separated	2 (0.6)	1 (0.3%)
Divorced	6 (1.7%)	5 (1.6%)
Domestic partnered	3 (0.8%)	4 (1.3%)
Previous Use of Hormonal Contraceptives
No	347 (95.3%)	299 (93.7%)	0.36
Yes	17 (4.7%)	20 (6.3%)
Parity
Nulliparous	332 (91.2%)	298 (93.4%)	0.28
Parous	32 (8.8%)	21 (6.6%)

^aContinuous variables are expressed as means ± SE and categorical variables are expressed as frequency (%).

^bNon-completers includes women who consented to the study but were not randomized because of failure to complete baseline measurements (n = 292) and women who were randomized but dropped out after randomization (n = 72).

^cp-values are based on Student t-test for continuous variables and χ² test for categorical variables.