NPA personality theory
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The relevance of beauty pageants
Non-sanguine (A and PA) types are not naturally drawn to exhibitionistic entertainment, especially if a lot of smiling is required. Thus, if you find even a small percentage of non-sanguine types in beauty pageant contestants and entertainers (like we did in Vietnam), then it is a sure bet that the population at large has a significant prevalence of non-sanguine types.
Here is an example from Poland: