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The intercorrelation of four factors of socio-economic origin, occupation of the father, level of education of the subject, number of children in the family, order of birth and also the age of the subject, on the variation of stature and weight has been studied in a male population of young Belgian adults. Our results show that socio­economic factors have to be better defined than merely occupational level; the correlation with stature is higher with the level of schooling of the subject than with the occupation of the father, the correlation with weight is also higher with the level of schooling and even with the age of the subject. The influence on stature and weight of the number of children and of the birth order is very limited in our sample.