Birth month affects onset of menopause?

[Tez]

http://www.medicalnewstoday.com/medicalnews.php?newsid=24237

How do they know the time of onset of menopause isn't affecting the birth month? Linear thinkers...

 

[delphi_ote]

http://www.medicalnewstoday.com/medicalnews.php?newsid=24237

How do they know the time of onset of menopause isn't affecting the birth month? Linear thinkers...

Actually, it very well could be common genetic traits in the mother and daughter that cause this correlation.