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Family Relationships And Sibling Intelligence

Table 7:

Predictors IQ (younger sibling)
R R2 F p
Model 1 .43 .19 3.93 .01
Control variables a
Model 2 .52 .08 4.68 .00
Sibling age gap .19 .14
First child sex .27 .03
Second child sex .24 .05
Maternal Control ‒.30 .02
Total R2 .27
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