Table A.1.
Descriptive Statistics for Girls and Boys
| Girls | Boys | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Variable | Measure | N | Min. | Max. | Mean | SD | Skew | Kurtosis | N | Min. | Max. | Mean | SD | Skew | Kurtosis |
| Controls | |||||||||||||||
| Age | 174 | 6.10 | 8.81 | 7.585 | 0.425 | 0.007 | 1.107 | 135 | 6.69 | 9.02 | 7.681 | 0.441 | 0.431 | −0.067 | |
| Story Problems | 174 | 0 | 14 | 6.138 | 3.309 | 0.280 | −0.599 | 134 | 1 | 14 | 7.007 | 3.534 | 0.337 | −0.841 | |
| Addition 0–12 | 174 | 2 | 22 | 8.316 | 4.565 | 0.820 | 0.299 | 133 | 1 | 22 | 8.722 | 4.887 | 0.615 | −0.201 | |
| Addition 0–18 | 174 | 0 | 16 | 6.017 | 3.547 | 0.548 | −0.122 | 133 | 0 | 16 | 6.226 | 3.513 | 0.494 | 0.060 | |
| DD Addition | 173 | 0 | 12 | 3.254 | 3.024 | 0.726 | −0.356 | 132 | 0 | 12 | 3.212 | 3.111 | 0.908 | 0.062 | |
| Subtraction 0–12 | 174 | 0 | 12 | 4.052 | 2.499 | 0.633 | 0.002 | 133 | 0 | 12 | 4.744 | 2.811 | 0.586 | 0.165 | |
| Subtraction 0–18 | 174 | 0 | 10 | 2.885 | 2.229 | 0.805 | 0.101 | 133 | 0 | 11 | 3.368 | 2.610 | 0.975 | 0.874 | |
| DD Subtraction | 173 | 0 | 9 | 2.358 | 2.597 | 0.992 | 0.166 | 132 | 0 | 9 | 2.053 | 2.662 | 1.093 | 0.079 | |
| WASI MR | 174 | 2 | 26 | 11.270 | 5.686 | 0.727 | −0.582 | 135 | 3 | 28 | 12.000 | 5.869 | 0.591 | −0.518 | |
| WJ-CF | 174 | 3 | 27 | 11.253 | 5.492 | 0.333 | −0.597 | 135 | 1 | 27 | 11.489 | 6.028 | 0.767 | 0.226 | |
| WMTB-C LR | 174 | 0 | 16 | 7.121 | 3.838 | −0.010 | −0.538 | 135 | 0 | 16 | 7.215 | 3.724 | −0.244 | −0.236 | |
| WMTB-C CR | 174 | 4 | 24 | 13.977 | 4.394 | 0.053 | −0.390 | 135 | 2 | 26 | 14.341 | 4.678 | 0.175 | 0.031 | |
| Predictors | |||||||||||||||
| WASI Vocabulary | 174 | 7 | 37 | 22.149 | 5.938 | 0.126 | 0.188 | 135 | 5 | 37 | 21.919 | 7.089 | −0.037 | −0.368 | |
| WDRB LC | 174 | 5 | 29 | 16.172 | 4.495 | −0.382 | 0.097 | 135 | 5 | 26 | 17.015 | 4.985 | −0.441 | −0.236 | |
| WIF-B | 174 | 0 | 111 | 41.667 | 24.485 | 0.387 | −0.594 | 135 | 2 | 111 | 41.935 | 24.836 | 0.385 | −0.505 | |
| WIF-N | 173 | 1 | 120 | 56.543 | 22.107 | −0.171 | 0.046 | 135 | 7 | 105 | 55.733 | 22.687 | −0.070 | −0.612 | |
| Outcomes | |||||||||||||||
| ITBS9 b | 152 | 1 | 17 | 9.711 | 3.816 | −0.121 | −0.730 | 115 | 2 | 17 | 10.670 | 3.573 | −0.270 | −0.496 | |
| ITBS10 b | 152 | 1 | 11 | 5.257 | 2.073 | 0.315 | −0.363 | 115 | 1 | 11 | 5.678 | 2.308 | 0.332 | −0.588 | |
| VSP b | 152 | 0 | 29 | 11.066 | 6.756 | 0.541 | −0.199 | 115 | 0 | 29 | 11.043 | 6.719 | 0.684 | 0.246 | |
Note. Raw scores reported; SD = Standard deviation; Min. = Minimum; Max. = Maximum; Age = Age in 2nd grade; DD = Double digit; WASI = Wechsler Abbreviated Scale of Intelligence; MR = Matrix Reasoning; WJ=III = Woodcock-Johnson; CF = Concept Formation; WMTB-C = Working Memory Test Battery for Children; L/CR = Listening/counting recall; WDRB = Woodcock Diagnostic Reading Battery; LC = Listening comprehension; WIF-B/N = Word identification fluency form B/N; VSP = Vanderbilt Story Problems; ITBS9/10 = Iowa Test of Basic Skills level 9/10.