Turkish children's performance on Denver II: effect of sex and mother's education.

One thousand and ninety-one healthy Turkish children were tested with the Denver II developmental screening test and the data were analysed for sex and sociocultural differences. Few and inconsistent differences were observed between boys and girls. On the other hand, there were marked differences between sociocultural groups, particularly in terms of fine motor and language areas and in older preschool children. The effect of maternal education on the child's development is more important in countries where preschool education is not commonly available. Whether this effect diminishes after 1 or 2 years of schooling is to be investigated.