and that associations with low infant growth rates are partly determined before birth.' It is not clear what D P Davies and J Matthes mean by "nutritional and metabolic stress."Whatever it is, for their explanation to be correct it would have to be independent of social class to explain our observations.In the Hertfordshire study birth weight and plasma glucose, insulin, and proinsulin concentrations were not related to social class, either at birth or currently.
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Paterson-Brown et al. (1991) studied this question.