Range of individuals Results.

There is very small but steady improvement with age in this test, the difference between 9 and 15 years being only 44 more spots correctly reproduced out of 33, while the gain at each age only exceeds one at 14 years.

The test appears to be affected much more by the intelligence than the age of the child, as is shown by the close correspondence between the range of the individuals at each age.

Mr Burt found a correlation with intelligence of -76 at the Oxford Preparatory and -75 at*the Oxford Elementary School 1.

The reliability of the test has always been found to be rather low 50 and -55 by Mr Burt.