Intelligence quotient (IQ) differences among groups according to sex, and demographic and other variables have been explored for a variety of intelligence tests. This investigation analyzed data from the standardization sample for the 1981 Wechsler Adult Intelligence Scale-Revised (WAIS-R) to determine the relationship of WAIS-R IQs to the demographic variables upon which the sample was stratified. The sample was made up of 1,880 adults stratified according to sex and age (equal numbers of male and females within nine age groups), race, occupation, urban-rural residence, geographic region, and education. There were 1,664 whites and 216 nonwhites. The nonwhites included 192 blacks and 24 persons from other nonwhite groups. Means and standard deviations were computed, compared, and reported for verbal, performance, and full scale IQs. The differences on mean IQs due to sex, urban-rural residence, and geographic regions were slight. However, there were substantial differences due to race, occupation, and education. There was a 14 to 15 point difference in favor of whites between the WAIS-R IQs of whites and blacks. There was a 17.5 to 22.4 point difference between the WAIS-R IQs of the highest and lowest ranked occupations. There was a 26.7 to 33.5 point difference bewtween the WAIS-R IQs of the highest and lowest categories of educational attainment. (Author/JAC)