This is the second report on the school achievement of children six to eleven years of age in the noninstitutionalized population of the United States, as estimated from the Reading and Arithmetic subtest data of the Wide Range Achievement Test obtained in the Health Examination Survey of 1963-65. It contains findings by selected demographic and socioeconomic variables. A probability sample of the nation's noninstitutionalized children six to eleven years of age was selected and examined. The examination focused primarily on health factors related to growth and development. It included an examination by a pediatrician, assisted by a nurse; an examination by a dentist; tests administered by a psychologist; and, a variety of tests and measurements by specially trained technicians. Field collection operations started in July 1963 and were completed in December 1964. There were 7119 children examined. The examinees were closely representative of the roughly 24 million noninstitutionalized children, six to eleven years of age, in the United States. The psychological test battery included the Vocabulary and Block Design subtests of the Wechsler Intelligence Scale for Children, the Draw-A-Person test, five cards of the Thematic Apperception Test, and the reading and arithmetic subtests of the Wide Range Achievement Test. (Author/JM)