In a longitudinal study of women and their first-born children the relationship between type of day care experience and cognitive and language development at 18 mths of age was considered. There was a strong association between socio-economic characteristics and type of day care and analyses allowed for this. The results for cognitive development indicate a relationship with mother's education but not with type of day care. For language development the results indicate that children who experience group care were less likely to show much production of different word combinations, but that this was related to the children's language environments.
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Melhuish et al. (1990) studied this question.
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