Eating Problems and Overlap with ADHD and Autism Spectrum Disorders in a Nationwide Twin Study of 9- and 12-Year-Old Children
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.
