Effects of prior testing lasting a full year in NCANDA adolescents: Contributions from age, sex, socioeconomic status, ethnicity, site, family history of alcohol or drug abuse, and baseline performance.

Baseline test performance In the full general additive model the amount of variance that was attributable to baseline test performance was highly significant for all 16 composite scores and ranged from a high of 47% for the Attention Accuracy composite to a low of 5% for the General Ability Accuracy composite ( Table 2 and Fig. 4 ).

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