Nature vs. Nurture: Seasonal Affective Disorder

"At some point in their life, it is estimated that 2-3% of Canadians will experience SAD. To add to that, 15% of individuals will experience milder (and less impairing) SAD. "

https://www.medscape.com/viewarticle/958729?spon=12&uac=392623PN&impID=3645958&sso=true&faf=1&src=WNL_mdpls_210917_mscpedit_psych