Table 3.
Intraclass correlations, heritability estimates, and cross-twin cross-trait correlations for the collapsed sample and by gender.
| Intraclass correlations (95% CI:s) | Heritability estimates (95% CI:s) | Cross-twin, cross-trait correlations (95% CI:s) | Phenotypic correlations (95% CI:s) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| EAT-P | MZ | DZ ss | A | C | E | ADHD | ASD | ADHD | ASD | ||
| MZ | DZ ss | MZ | DZ ss | ||||||||
| ALL | 0.42 | 0.18 | 0.44 | 0.00 | 0.56 | 0.16 | 0.13 | 0.15 | 0.11 | 0.15 | 0.20 |
| (0.39–0.45) | (0.15–0.21) | (0.40–0.48) | (0.00–0.02) | (0.53–0.60) | (0.11–0.21) | (0.09–0.17) | (0.10–0.19) | (0.07–0.15) | (0.13–0.18) | (0.18–0.22) | |
| Boys | 0.34 | 0.10 | 0.32 | 0.00 | 0.68 | 0.19 | 0.15 | 0.17 | 0.14 | 0.18 | 0.23 |
| (0.30–0.38) | (0.06–0.14) | (0.25–0.38) | (0.00–0.05) | (0.62–0.73) | (0.12–0.25) | (0.09–0.21) | (0.10–0.24) | (0.08–0.20) | (0.15–0.21) | (0.20–0.26) | |
| Girls | 0.48 | 0.23 | 0.53 | 0.00 | 0.47 | 0.16 | 0.14 | 0.17 | 0.09 | 0.16 | 0.18 |
| (45–0.52) | (0.18–0.27) | (0.43–0.52) | (0.00–0.04) | (0.43–0.52) | (0.09–0.22) | (0.08–0.20) | (0.10–0.23) | (0.02–0.15) | (0.12–0.19) | (0.15–0.21) | |
EAT-P: eating problems, MZ: monozygotic, DZ-ss: dizygotic same sex, CI:s: confidence intervals.
A: genetic factors, C: shared environmental factors, and E: nonshared environmental factors.
Pairs where information was eligible from both twins were included in the analyses, giving a total of 1620 MZ boys, 1694; DZ girls, 2310 DZ-ss boys 2310, and 1944 DZ-ss girls.