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could hormones in the food chain be a possible factor...?
do kids with precocious puberty show a tendency towards high IQ's ?
The median age of menarche in contemporary British teenagers is around 13 years. In our study geographical, social, and ethnic variations were small, suggesting that non-response bias in menarcheal age was likely to be limited. Comparison with British girls born between 1950 and 1965 (table) suggests that the median menarcheal age reported here is close to or slightly below the earlier findings. Two points emerge clearly from the results. Firstly, any decrease in average menarcheal age during the past 20-30 years has been small (almost certainly less than six months), particularly when compared with the reduction of a year or more that occurred in many European countries (including Britain) between the late 19th and mid 20th centuries. Secondly, even though no appreciable recent decrease in menarcheal age has occurred, almost one girl in eight reaches menarche while still at primary school. This needs to be taken into account when providing sanitary facilities and health information for female pupils in primary school.