Study sample characteristics, Denmark 2003–2007.
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N = 1,772. For the dichotomous predictor variables, testing the significance of the point-biserial correlations is equivalent to testing the significance of mean differences on FSIQ between the two subsamples defined by the binary predictor.aMultiple R for categories 1 and 2+.bTechnically, R is positive; here, the minus sign indicates the direction of the association.cReference category: Females.dMultiple R’s for linear and quadratic variables.
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2015-12-02
