Some variables have a significant influence in the results of intelligence tests, what. leads to the need of considering them and controlling them in studies with these tests. Among them we can highlight the socioeconomic level, the age, the sex and the school grade. The results showed differences between socioeconomic levels in the Test of Goodenough, in the Raven Coloured Progressive Matrices and in the Columbia. Mental Maturity Scale. Significant differences were found between mean scores of sexes in the Test of Goodenough, in the R-1 Test and in the D.70, but not in Raven and Columbia. The chronological age should always be considered in the assessment ofthe children's intelligence, because the results in the tests should increase as the child grows old. The same happens with the school grade, if we consider school grades or the school levels.
Psychological assessment; Intelligence tests; Norms of tests
