Table 1.
Phenotypic correlations (rp) and proportions of the phenotypic correlations due to genetic (A), shared environmental (C) and non-shared environmental (E) factors
| Reading |
Inattentiveness |
Hyperactivity-impulsivity |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| ADHD combined | Inattentiveness | Hyp-imp. | Hyp-imp. | Reading comp. | Word decoding | Reading comp. | Word decoding | Reading comp.–word decoding | |
| rp | −.26 (−.28/−.24) | −.27 (−.29/−.25) | −.19 (−.21/−.17) | .54 (.52/.55) | −.22 (−.24/−.20) | −.23 (−.25/−.21) | −.20 (−.22/−.18) | −.13 (−.15/−.10) | .48 (.47/.49) |
| Proportion of rp due to: | |||||||||
| A | .80(.64/.96) | .74(.61/.88) | .52(.34/.71) | .74(.67/.80) | .69(.51/.87) | .77(.61/.92) | .50(.31/.70) | .48(.20/.77) | .65(.56/.75) |
| C | .12(−.04/.26) | .10(−.01/.22) | .47(.29/.64) | .20(.14/.24) | .15(.00/.31) | .06(−.08/.20) | .49(.31/.66) | .49(.22/.57) | .24(.16/.32) |
| E | .09(.05/.12) | .16(.12/.20) | .01(−.03/.05) | .06(.05/.08) | .16(.10/.22) | .17(.12/.22) | .01(−.04/.06) | .03(−.03/.10) | .11(.08/.14) |
Note. 95% confidence intervals in parentheses. Reading refers to a composite of the word decoding and reading comprehension measures.
Hyp-imp = hyperactivity-impulsivity.
Reading comp. = reading comprehension.