Table 2.
Twin intraclass correlations for %Fat and PA (total MET-minutes) in girls and boys.
| Variables | Girls | Boys | ||||||
|---|---|---|---|---|---|---|---|---|
| MZ (n = 40–81 pairs) |
DZ (n = 49–73 pairs) |
z | pa | MZ (n = 21–50 pairs) |
DZ (n = 15–48 pairs) |
z | pa | |
| Twin Intraclass Correlations | ||||||||
| Percent Body Fat | .90* (.87, .94) | .57* (.45, .67) | 4.63 | <.01 | .91* (.87, .94) | .47* (.30, .61) | 4.85 | <.01 |
| Physical Activity | .28* (.06, .47) | .43* (.26, .58) | −0.80 | .21 | .59* (.35, .76) | .77* (.58, .89) | −0.94 | .17 |
Note. MZ = monozygotic; DZ = dizygotic. The z statistic examines the difference between MZ and DZ twin correlations.
*
p < .05, two-tailed. The correlation is significantly different from zero. Significant differences between MZ and DZ correlations are indicated by boldface.
a
The p value is one-tailed.