Vaniver comments on 2014 Less Wrong Census/Survey - Less Wrong
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It is common for them to be different; that's why the survey asks for each hand separately. Inter-rater reliability (given the same scan) for this measurement is in the r=.9 range, if I remember correctly, so don't feel that bad about it being variable; the underlying quantity is actually difficult to measure (but meaningful nonetheless).
I don't doubt that the measure is meaningful. The influence is surely real. The question is rather whether anything meaningful can be derived on the individual level.