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Performance (norm age-equivalents) of a group of 24 Williams syndrome children and adolescents (chronological ages 6.5–15 years), shown as median scores across tests within the four subscales of the Movement ABC battery (Henderson & Sugden, 1992). Points plotted at 3 years on the age-equivalence scale are children who were unable to perform at the minimum (4-year-old equivalent) level for the test. The diagonal line indicates age-equivalence = chronological age.
