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16 year limit age groups age of onset age of puberty age of pubescence Ameri American Danes American Italian American average age Barr Scale brachycephalic calculated cent cephalic index child chronological age coefficients Comparison Copenhagen correlation ratio Danes and Italians Danes Italians Danish American Italian Danish group Denmark differences in intelligence Differences In Mental dolicho dolichocephalic Engelman European American Experimental Study fact Factors father's occupation findings four groups groups are compared Groups Studied height and weight home country immigrant included indicate influence Intelligence Quotient International Intelligence Test Italian groups Italy Klineberg measure menarche mental age mental and physical Mental Tests mesocephalic native Nordic number of children onset of menstruation onset of puberty Physical Traits physiological population Previous Investigations Psychol Psychology Psychophysical Race Differences raw averages relationship reliable differences roundheaded social status South European group Spearman-Wirth method standard deviations tion various racial groups Volume Waukegan weight-height ratio York City