This study explored a longitudinal dataset of 10,663 children (50% girls) to examine a set of psychological and socio-demographic factors that influenced children's cognitive ability (intelligence test scores) at the age of 7 years, using a large, nationally representative birth cohort. We set out to test a model based on the longitudinal nature of the data which was gathered at three points in time. Results of correlational analyses showed that parental social status indicators (parental education and family income), maternal psychological distress, parent-child relationship quality, maternal traits extraversion and emotional stability were all significantly associated with children's cognitive ability/intelligence. Structural equation modeling showed that parental social status had a relatively strong influence on children's cognitive ability (path coefficient = 0.49, p < 0.001). Further, parent-child relationship quality (path coefficient = 0.10, p < 0.001) and maternal trait emotional stability (path coefficient = 0.04, p < 0.05) had significant but very modest direct effects on the outcome variable, accounting for 28% of the variance. A significance of mediation test showed that parent-child relationship quality was both a predictor and a mediator (z = 7.16, p < 0.001), that the effect of maternal psychological distress on children's cognitive ability in part, mediated through parent-child relationship quality. The implications and limitations are discussed.
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