Onset of menstrual cycle and menses features among secondary school girls in Italy: A questionnaire study on 3,783 students.

Given that Italy stretches from 47°N to 35°N latitudes, the irradiation varies accordingly from North to South in an increasing trend (global horizontal annual radiation 1350 kWh/m 2 at North and 1500 kWh/m 2 at South), and seasonality is more pronounced at North, differently from other studies.[ 27 ] This survey suggests that latitude and radiation dose may not be associated with age at menarche in Italy.

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