Intelligence Tests at the Royal Eastern Counties' Institution

Ninety-two patients were tested in this way. In 69 cases the average I.Q. arrived at from the two Performance Tests was higher than the Stanford I.Q. In three the results were the same, and in 20 the Stanford I.Q. was higher than the Average Performance I.Q. Further, where the Performance I.Q. was above the Stanford, it was much more above it than the Stanford was above the Performance Test result in the 20 cases in which the latter was the case. Where (he Performance average was above the Stanford, it was anything up to 42 points above it, and in only 24 out of 69 cases was the difference nine or less than nine points. The average for the whole 69 was 15 points above. Where the Performance average was below the Stanford, it was in 19 cases out of the 20 nine or less than nine points below, and the average difference was only five points.