Table 1.
Descriptive statistics for participant demographics and symptoms (N = 688)
| Participant Characteristics | Mean (SD) or N (%) |
|---|---|
| Zygosity | |
| Monozygotic | 284 (41.3%) |
| Dizygotic | 376 (54.7%) |
| Cotwin dropped/not yet completed study | 28 (4.1%) |
| Age | 21.80 (3.19); range = 15–30 |
| Racial identity | |
| White | 619 (90.0%) |
| Black/African American | 35 (5.1%) |
| Asian/Asian American | 8 (1.2%) |
| More than one race | 26 (3.8%) |
| Hispanic/Latinx ethnicity | 40 (5.8%) |
| Sex on original birth certificate | |
| Female | 688 (100%) |
| Gender identity | |
| Woman/female | 422 (99.1%) |
| Transgender | 2 (0.5%) |
| Nonbinary/genderfluid/genderqueer | 2 (0.5%) |
| Sexual orientation | |
| Heterosexual | 322 (75.6%) |
| Bisexual | 38 (8.9%) |
| Queer | 1 (0.2%) |
| Pansexual | 8 (1.9%) |
| Gay/lesbian | 9 (2.1%) |
| Asexual | 36 (8.5%) |
| Not listed | 11 (2.6%) |
| No response | 1 (0.2%) |
| Combined parental income | |
| <$20,000 | 11 (1.6%) |
| $20,000-$40,000 | 31 (4.5%) |
| $40,000-$60,000 | 67 (9.7%) |
| $60,000-$100,000 | 208 (30.2%) |
| >$100,000 | 348 (50.6%) |
| Not specified/prefer not to answer | 23 (3.3%) |
| Body mass index (BMI) | 24.33 (5.05); range = 16.48–58.12 |
| Any binge eating during the study | 187 (27.2%) |
| Days binge eating during the study for participants who reported this behavior | 5.13 (6.31); range = 1–45 |
| Any purging during the study | 58 (8.4%) |
| Days purging during the study for participants who reported this behavior | 3.00 (3.88); range = 1–21 |
| Any dieting during the study | 272 (39.5%) |
| Days dieting during the study for participants who reported this behavior | 17.25 (17.06); range = 1–49 |
Note: Sample sizes for gender identity and sexual orientation are lower than the total sample size because these items were added after some participants had already completed the study.