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age and sex average I. Q. average intelligence quotient birth month birth order child child's birth chrono chronological age CLINIC FAMILY2 SCHOOL Clinic Group assigned CLINIC GROUP FAMILY coefficient of variation COMPARATIVE SIBLING RESEMBLANCE comparison group difference in parent DOCTOR OF PHILOSOPHY eliminated factors FAMILY CLINIC FAMILY2 FAMILY GROUP CLINIC Family Resemblance family sizes FAMILY2 SCHOOL Average father's age girl GROUP CLINIC GROUP GROUP FAMILY GROUP2 GROUP º GROUP SIZE VARIA groups of unrelated heredity I. Q. INDEX I. Q. inheritance of intelligence INTELLIGENCE IN FAMILY less variability ligence logical age matched mental traits months old mother mother's age natal interval pairs of siblings parent age possible determinants Possible Effectors Psychological Clinic recomputed represent resemblance in intel resemblance in intelligence School Group Social Service Department Standard Deviation Steckel 43 tabulated test battery TION AV TION I. Q. INDEX University of Pennsylvania unrelated children similar unrelated group variation indices