Seems likely that a large chunk of this is hormonally affected - seeing as the changes kick in at the start of puberty. In which case it's worth remembering th

Seems likely that a large chunk of this is hormonally affected - seeing as the changes kick in at the start of puberty. In which case it's worth remembering that hormonal levels vary dramatically for both men and women, and I'd expect that over a large sample size you'd see a fair amount of crossover.