TABLE III.
Summary of Basic Statistics for Cognitive Data (Number of Observations, Means, Range, Standard Deviations) for Variables Used in Estimating Heritability
| Traits | N | Mean | Lower | Upper | SD |
|---|---|---|---|---|---|
| Vocabulary | 85 | 12.2286 | 3 | 18 | 3.5157 |
| Similarities | 85 | 11.2522 | 4 | 17 | 3.1088 |
| Information | 85 | 11.4024 | 3 | 17 | 2.9406 |
| Block Design | 69 | 11.3733 | 4 | 17 | 2.8653 |
| Matrix Reasoning | 86 | 11.8980 | 4 | 17 | 2.9468 |
| Digits Forward | 85 | 7.1420 | 4 | 17 | 1.6878 |
| Digits Back | 85 | 5.3882 | 3 | 8 | 1.5973 |
| Digit Span | 85 | 11.1059 | 2 | 19 | 3.3573 |
| LN Sequencing | 84 | 11.0598 | 2 | 19 | 3.3642 |
| Digit Symbol | 72 | 9.4246 | 3 | 18 | 3.1353 |
| WRAT Spell | 86 | 100.6674 | 11 | 127 | 15.9253 |
| WRAT Arithmetic | 86 | 98.0516 | 60 | 129 | 14.4246 |
| WRAT Reading | 85 | 105.1743 | 72 | 122 | 11.3159 |
| CVLT lists 1–5 Total | 86 | 40.6794 | 5 | 69 | 17.7256 |
| CVLT Immediate | 86 | −0.8439 | −5 | 2 | 1.7609 |
| CVLT Delayed | 86 | −1.0161 | −5 | 2 | 1.6937 |
| CVLT Recognition | 86 | −1.6002 | −5 | 1 | 1.6851 |
| Verbal Pairs Immediate | 84 | 10.2687 | 2 | 16 | 3.1652 |
| Verbal Pairs Delayed | 84 | 10.3353 | 2 | 17 | 3.0401 |
| Visual Memory Immediate | 83 | 64.6177 | 1 | 99 | 33.2708 |
| Visual Memory Delayed | 82 | 60.6501 | 1 | 99 | 35.6279 |
| Boston Naming | 83 | 54.5596 | 26 | 62 | 6.8462 |
| PPVT | 85 | 103.4735 | 7 | 147 | 17.5183 |
| COWA Total | 84 | 41.2784 | 21 | 70 | 11.0855 |
| Stroop Interference | 80 | 49.4343 | 20 | 80 | 10.9628 |
| Trails A Raw | 85 | 33.4127 | 15 | 76 | 11.7666 |
| Trails A Percentile | 59 | 44.2373 | 1 | 95 | 26.2763 |
| Trails B Raw | 81 | 77.8950 | 31 | 279 | 39.4744 |
| Trails B Percentile | 53 | 45.1346 | 1 | 99 | 28.1921 |
| Tapping Dominant Raw | 82 | 44.0870 | 18.8 | 59.4 | 7.9763 |
| Tapping Dominant Percentile | 69 | 23.4898 | 0 | 93 | 25.2260 |
| Tapping Non-Dominant Raw | 79 | 40.8338 | 19.8 | 58 | 7.6318 |
| Tapping Non-Dominant Percentile | 69 | 31.2148 | 1 | 95 | 27.9688 |
| Pegboard Right Raw | 89 | 13.5976 | 9.33 | 20 | 1.9869 |
| Pegboard Right Percentile | 75 | 5.3034 | 1 | 70 | 13.0094 |
| Pegboard left raw | 90 | 13.2429 | 5.66 | 19.33 | 2.1865 |
| Pegboard both Raw | 89 | 11.3410 | 3.67 | 20 | 2.3659 |
| Pegboard both Percentile | 73 | 8.9888 | 1 | 76 | 13.5467 |
| Pegboard Assemblies Raw | 87 | 6.1305 | −3 | 43 | 12.7476 |
| Laterality Index | 87 | 0.0275 | −0.16 | 0.36 | 0.0671 |
| Factor 1: “g” | 48 | 0.0921 | −2.33137 | 1.62945 | 0.9324 |
| Factor 2: Verbal Memory | 48 | 0.0663 | −2.6121 | 1.98963 | 1.0003 |
| Factor 3: WM | 48 | −0.0271 | −2.34527 | 1.79213 | 0.9525 |
| Factor 4: Visual Memory | 48 | 0.0175 | −4.22581 | 1.5986 | 0.9990 |
| Factor 5: Speed | 48 | −0.0631 | −2.79028 | 2.65622 | 1.0152 |
| Factor 6: Inhibition | 48 | −0.3517 | −2.02255 | 1.6558 | 0.8491 |
| Factor 7: Laterality | 48 | −0.0707 | −1.83839 | 3.78296 | 0.9203 |
| Factor 8: Motor | 48 | 0.0888 | −1.45331 | 3.69351 | 0.9400 |