No interest in money is an extreme position to take. Small differences in interest can lead to big differences in outcome. There is also some time lag with th

No interest in money is an extreme position to take. Small differences in interest can lead to big differences in outcome. There is also some time lag with this data, studies have shown boys doing worse academically over time (relative to girls) so the age group in 2015 is largely in school, university, or just entering the workforce. Women in their 20's already outperform men in their 20's in earnings and we don't yet know if that trend is going to carry on into later years given new ability gaps. It hasn't carried on historically due to a wide variety of reasons including the adverse affects of maternity leave on careers but we haven't seen an academic gap of this magnitude between the genders either before so that may be changing. It's also worth noting that a lot of top earning careers are looking at a slice of top performers academically, and the distribution of academic performance for males tends to be higher variance so even with a lower average we may see similar numbers of top performers in both genders.