The IQ difference (equivalent to approximately 3 IQ points) is of questionable clinical significance. The height and weight differences are larger, but few children were below the 3rd centile at follow up. It is unclear to what extent observed differences reflect causal relations or confounding due to other variables. In the light of these results the aggressive approach to identification and management of failure to thrive needs reassessing.
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Mary Rudolf (2005) studied this question.
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