Table 3.
Comparison of Age, Gender, Race, and Martial Status Across MZ and DZ Twins
| Same-sex MZ twins (MZ) (n = 1838) | Same-sex DZ twins (DZS) (n = 1268) | Opposite-sex DZ twins (DZO) (n = 892) | Comparisons1 | |
|---|---|---|---|---|
| Age (years) | 35.9 ± 6.0 | 36.1 ± 6.1 | 35.9 ± 5.9 | MZ = DZS = DZO |
| Gender | ||||
| Male | 44.2% | 43.5% | 50.0% | DZO > MZ = DZS |
| Female | 55.8% | 56.5% | 50.0% | |
| Race | ||||
| Caucasian | 96.0% | 94.2% | 94.7% | MZ = DZS = DZO |
| African–American | 3.0% | 4.0% | 4.2% | |
| Other | 1.0% | 1.8% | 1.1% | |
| Marital Status | ||||
| Never married | 62.7% | 63.1% | 65.4% | MZ = DZS = DZO |
| Married | 33.5% | 33.2% | 30.9% | |
| Other | 3.8% | 3.7% | 3.7% | |
Note: The ‘other’ category in race includes Hispanics, Asians, and any other racial/ethnic category that is not Caucasian or African–American. The ‘other’ group in marital status includes individuals who are separated, divorced, or widowed.
1
Differences between groups determined by post-hoc testing (p < .05) after ANOVA or chi-square statistics revealed an overall p < .05 where statistically significant.