Standard Age Score or Standard Score

A standard score scale in which the mean score for each age group on an assessment is set at 100 and the standard deviation at 15. For any age group a given numerical value has the same meaning in terms of standing relative to the group. For example, an eight-year-old and a nine-year-old, each of whom has a standard age score of 105, have performed equally well in relation to the average for their respective age groups.