how much variance explainable by IQ? M Stewart, Los Alamos National Laboratory 30 August 2011 Your longevity map looks like an IQ map, and Gottfredson has clearly demonstrated that IQ causes SES, not the reverse. How much of the variance in longevity or "falling behind" is explainable through county average IQ differences? Or was this not explored? Competing interests No competing interests, just curious.