These numbers can't possibly be right. Why is New Zealand, with a higher percentage of the population Maori and Asian (less likely to tolerate lactose) at 10% l

These numbers can't possibly be right. Why is New Zealand, with a higher percentage of the population Maori and Asian (less likely to tolerate lactose) at 10% lactose intolerance vs 44% in Australia? And 81% of Czechs are lactose intolerant when all their neighbours are much lower?