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Potassium levels are lower in females

As detailed in an article "Sex and Age Differences in Serum Potassium in the United States" (https://academic.oup.com/clinchem/article/49/1/190/5639035), potassium levels are lower in women than men.  

Women are lower by about 0.15 mEq/L and the lowest levels in everyone are in early adulthood.  

For people with hypokalemic periodic paralysis from a known sodium channel or calcium channel variant, equal numbers of males and females have the problematic variants.  But men are somewhat treated by their potassium levels running higher, and as one gets in the 60s and older, everyone's potassium level is rising, such that a woman in her 70s has levels similar to those of a man in his 30s.