Regression based IQ slopes from 1978/80 to 2012 and 1992 to 2012.
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Slope: unstandardized m (unit: IQ increase per year). Because of small values four digits are presented. In the longer period from 1978/80 to 2012 the rises are slightly larger (arithmetic mean across the four groups: m = 0.13) than in the shorter and more recent period from 1992 to 2012 (arithmetic mean: m = 0.11).Regression based IQ slopes from 1978/80 to 2012 and 1992 to 2012.
创建时间：
2015-12-03
