6 in 1000: http://healthresearchfunding.org/central-heterochromia-statistics/ It disturbs me that there's a group called health research funding with an interest in heterochromia, a lovely condition in Persian cats,David Bowie and people with a white forelock -van Waardenburg's syndrome. They quote 6 in 1000, other suggests are on the same order of magnitude, about 1%.
Answered 1/10/2016
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