As expected, hand preference for writing had a significant multivariate effect on performance and therefore has to be taken into account in the derivation of the normative data for these
two neuropsychological assessment instruments. Additionally, girls outperformed boys and older children performed the Gardner Steadiness Test and the Purdue Pegboard better than younger children. The predictive relationship between age of the child and performance included both linear and curvilinear components. The performance differences between the preferred and the nonpreferred hands in the Gardner Steadiness Test and the Purdue Pegboard demonstrated a significant age, but not sex, effect.