Table 1.
MTA Probands | LNCG | Lower triangle = MTA probands; Upper triangle = LNCG | |||||||||||||||||||
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M | SD | M | SD | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | |
1. Impairmenta | −.01 | .94 | −1.20 | .89 | 1 | −.14* | −.08* | −.06* | −.05* | - | −.05* | −.04 | −.07* | .05* | −.11* | −.02 | −.03 | .03 | .19* | .24* | .28* |
2. Parent involve (adol) | 3.58 | .46 | 3.78 | .47 | −.12* | 1 | .20* | .00 | .10* | - | .09* | −.03 | .06* | .08* | .03 | −.05* | .02 | .03 | −.02 | .00 | −.08* |
3. Parent support (adult) | 2.95 | .84 | 2.94 | .83 | −.06* | .15* | 1 | .01 | −.02 | - | .21* | .07* | .10* | .05* | .03 | −.01 | −.03 | .01 | −.06* | −.03 | −.08* |
4. Agea | 17.10 | 5.00 | 16.91 | 4.91 | .15* | .01 | −.00 | 1 | .02 | - | −.00 | .01 | −.02 | −.04* | −.07* | −.01 | .27* | −.04 | .01 | −.06* | .02 |
5. Family income | 4.93 | 2.49 | 5.86 | 2.61 | .03 | .06* | −.05* | .04 | 1 | - | −.06* | −.31* | −.24* | .13* | .37* | −.24* | .06 | −.07 | −.04 | −.08* | −.03 |
6. Special education | 279.23 | 398.72 | - | - | .13* | .06* | .03 | −.01 | −.05* | 1 | - | - | - | - | - | - | - | - | - | - | - |
7. Female (%) | 19.89 | - | 19.77 | - | −.03 | .07* | .11* | .03 | .08* | −.06* | 1 | −.01 | .03 | .04 | .12* | −.02 | .00 | .00 | −.07* | −.00 | −.05 |
8. Black (%) | 19.71 | - | 11.24 | - | .05* | .02 | .12* | −.03 | −.22* | −.01 | −.01 | 1 | −.13* | −.12* | −.10* | .16* | −.05 | .04 | .01 | .00 | −.00 |
9. Hispanic (%) | 6.93 | - | 13.18 | - | −.01 | −.13* | .02 | −.00 | −.16* | .01 | −.05* | −.13* | 1 | −.13* | −.17* | .10* | −.12* | −.00 | −.04 | .03 | −.03 |
10. Other (%) | 12.04 | - | 11.24 | - | .03 | .00 | .06* | −.03 | −.08* | −.01 | −.04* | −.17* | −.09* | 1 | .04 | −.06* | .02 | .01 | .04 | .02 | .06* |
11. Attended college (%) | 42.15 | - | 67.87 | - | −.07* | .15* | −.02 | .07* | .27* | −.17* | .11* | −.07* | −.07* | .02 | 1 | −.27* | .18* | −.14* | −.01 | −.03 | −.02 |
12. Dropped out (%) | 10.22 | - | 2.71 | - | .09* | −.14* | −.00 | .02 | −.17* | .01 | −.04* | −.04* | .05* | .00 | −.32* | 1 | −.06 | .06 | .00 | −.02 | .03 |
13. Living indepa (%) | 35.78 | - | 43.81 | - | −.09* | −.01 | −.06 | .20* | .09* | −.12* | .05 | −.04 | −.05 | −.03 | .05 | −.08* | 1 | −.11* | .08 | .09* | −.08 |
14. Other livinga (%) | 2.64 | - | 1.55 | - | .04 | −.01 | .01 | .01 | .05 | −.01 | −.02 | −.01 | −.02 | −.01 | −.05 | .05 | −.12* | 1 | −.01 | −.03 | −.02 |
15. ADHD dxa (%) | 37.80 | - | 2.00 | - | .30* | −.05* | −.04 | −.23* | −.01 | .05* | −.02 | .06* | .00 | −.01 | −.06* | .02 | −.08* | −.01 | 1 | .13* | .16* |
16. Internalizing dxa (%) | 18.85 | - | 7.83 | - | .11* | .02 | .01 | −.26* | −.05* | .01 | .07* | .04* | .01 | .02 | −.04* | .01 | .02 | .04 | .19* | 1 | .16* |
17. Externalizing dxa (%) | 31.37 | - | 4.58 | - | .31* | −.12* | −.02 | −.25* | −.04* | .06* | −.05* | .04 | .03 | .01 | −.08* | .08* | −.10* | −.02 | .30* | .26* | 1 |
Note. Impairment factor scores are on a conditionally standardized scale, with values ranging from −2.27 to 2.33. On average, impairment scores for MTA probands were 1.2 standard deviations higher than for LNCG. Parent involvement ranged from 1 to 5. A score of 3=sometimes and 4=often. Parent support ranged from 1 to 5. A score of 3=very much and 4=extremely much. Family income at baseline was reported on a 9-point scale. Each point represented an interval of $10,000 in annual income. A score of 4=$30,000 to $40,000 per year; a score of 5=$40,000 to $50,000 per year.
Impairment, age, living arrangements, and diagnoses (ADHD, internalizing, externalizing) varied from wave to wave. Summary statistics in this table pool over all waves of assessment.
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