Partial correlations revealed that age, family income, and IQ were marginally significant predictors ( p s < 0.10).
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The sentences
Thus, the association between duration of music training and IQ was near-significant when demographic variables were held constant, although it was weaker than in previous correlational studies with older children (Schellenberg, 2006 , 2011a ; Corrigall et al., 2013 ) and in a quasi-experiment with same-age children (Schellenberg and Mankarious, 2012 ).