"Adolescent." . . "Achievement." . . . "A study of the achievement test used in the health examination surveys of persons aged 6-17 years"@en . . . . . . . . . . . "A study of the achievement test used in the Health Examination Surveys of persons aged 6-17 years"@en . . . . . . . "A study of the achievement test, used in the health examination surveys of persons aged 6-17 years"@en . . . . "Statistics"@en . . . . "Psychological Tests." . . "Infant." . . "Child." . . . .