Table 2.
Correlations for Decoding-related Measures by Gender and Zygosity
| MZ N=427 |
MZ Male N=197 |
MZ Female N=230 |
DZ N=825 |
DZ Male N=209 |
DZ Female N=210 |
DZ OS N=406 |
|
|---|---|---|---|---|---|---|---|
| Intraclass Correlation | |||||||
| Letter Naming Fluency | .64 | .67 | .61 | .47 | .47 | .53 | .43 |
| Phoneme Segmentation Fluency | .61 | .58 | .63 | .45 | .47 | .53 | .39 |
| Nonsense Word Fluency | .69 | .72 | .66 | .46 | .52 | .48 | .41 |
| Cross-twin Cross-trait Correlation | |||||||
| Letter Naming-Phoneme Segmentation | .36 | .38 | .35 | .29 | .26 | .39 | .26 |
| Letter Naming-Nonsense Word | .57 | .59 | .54 | .40 | .41 | .44 | .36 |
| Phoneme Segmentation -Nonsense Word | .43 | .45 | .41 | .30 | .28 | .42 | .25 |
| Phenotypic Correlation | |||||||
| Letter Naming-Phoneme Segmentation | .43 | .43 | .44 | .46 | .49 | .48 | .44 |
| Letter Naming-Nonsense Word | .68 | .69 | .67 | .70 | .72 | .71 | .68 |
| Phoneme Segmentation -Nonsense Word | .53 | .55 | .51 | .46 | .50 | .47 | .42 |
Note: Ns are pairs. OS = opposite-sex.