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BACKGR0UND 0F THE PRESENT STUDY
MATERIALS AND METH0DS
SUMMARY 0F RESULTS
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achievement and mental achievement tests adolescent age at menarche age at PHV Analysis of variance Annals of Human average and early average and late Broman core sample df Mean square differences in mean early and late early girls early maturing girls Educational Research father's occupation Figure gain in performance girls and boys Gothenburg growth spurt height and weight Human Biology interaction KUP-test from grade late boys late girls late maturing girls level of performance Lindgren Ljung maturation and social maturity groups mean PHV age Mean scores Mean SD Mean square F measurements menarcheal age mental growth mental performance Middle Sweden n.s. not significant peak height velocity PHV age distance physical and mental physical growth physical maturity present study puberty schoolchildren secondary sex characteristics secular trend Significance level social background social group III squares df Mean Stockholm subtest Swedish urban Tanner variation Sum