Extended Data Table 1. Participant Demographics.
| Total Epidemiologically- Ascertained Twins |
Eye-Tracking Participants (Twins) |
Eye-Tracking Participants (Non-Siblings) |
||||
|---|---|---|---|---|---|---|
|
| ||||||
| % | N | % | N | % | N | |
| Sex | ||||||
| Male | 47.8 | 172 | 55.4 | 92 | 52.4 | 44 |
| Female | 52.2 | 188 | 44.6 | 74 | 47.6 | 40 |
| Zygosity | ||||||
| Monozygotic | 35 | 126 | 49.4 | 82 | ||
| Dizygotic | 58.3 | 210 | 50.6 | 84 | ||
| same sex | 36.1 | 130 | 50.6 | 84 | N/A | N/A |
| opposite sex | 22.2 | 80 | 0 | 0 | ||
| Undetermined | 6.7 | 24 | 0 | 0 | ||
| Income | ||||||
| ≤ $29,999 | 19.4 | 70 | 15.7 | 26 | 6.1 | 5 |
| $30,000–$59,999 | 24.4 | 88 | 24.1 | 40 | 10.6 | 9 |
| $60,000–$89,999 | 21.7 | 78 | 22.9 | 38 | 18.6 | 16 |
| ≥ $90,000 | 30.6 | 110 | 37.3 | 62 | 56.6 | 46 |
| N/A | 3.9 | 14 | 0 | 0 | 8.1 | 7 |
| Race | ||||||
| Asian | 1.1 | 4 | 0 | 0 | 4.8 | 4 |
| Black/African-American | 21.1 | 76 | 14.5 | 24 | 4.8 | 4 |
| Caucasian | 77.8 | 280 | 85.5 | 142 | 78.5 | 66 |
| More than one race | 0 | 0 | 0 | 0 | 7.1 | 6 |
| Unknown / Not reported | 0 | 0 | 0 | 0 | 4.8 | 4 |
| Ethnicity | ||||||
| Hispanic | 7.8 | 28 | 8.4 | 14 | 7.3 | 6 |
| Non-Hispanic | 92.2 | 332 | 91.6 | 152 | 74.4 | 63 |
| Unknown / Not reported | 0 | 0 | 0 | 0 | 18.3 | 15 |