In the group of 8 children with standard scores out
of the normal range, 3 children produced developmental
errors only; 1 child produced non-developmental
errors only and 4 children produced both
types. Table II shows the types of errors produced
3 or more times by this group of 8 children. Again,
most (74.68%) errors were developmental in nature,
but this time the higher frequency of developmental
errors compared to non-developmental errors was
significant (t(7)¼2.817; p¼.025).