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. 2015 Jan;48:123–132. doi: 10.1016/j.intell.2014.11.005

Fig. 2.

Fig. 2

Familiality of high intelligence. Male siblings of high-intelligence probands (with a standardised score of 1.98) have significantly and substantially higher intelligence (mean = 0.81, SD = 0.81, N = 28,339) than the population (mean = 0, SD = 1, N = 727,810).