Factors Associated With General Cognitive Ability Further Divided Into Sub-categories.

<p>The color of the circles corresponds to the larger categories in which these sub-categories are grouped (inherent: blue; behavioral: orange; social environment: yellow and physical environment: green). The size of the circles is in proportion to the total number of publications included in the review (n = 258). The colored section in each circle represents the proportion of publications within each category that found a statistically significant association with general cognitive score (solid color–<i>P</i><0.05; pattern – 0.05<<i>P</i><0.10). This graphic is adapted from Strina et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0147741#pone.0147741.ref282" target="_blank">282</a>].</p

Flowchart of selection process for review.

<p>Flowchart of selection process for review.</p

Covariates Used Across Publications Included in the Review.

<p>Covariates Used Across Publications Included in the Review.</p

Factors Examined in Multiple Studies as EOI or IP of General Cognitive Ability.

<p>Factors Examined in Multiple Studies as EOI or IP of General Cognitive Ability.</p

Summary of Characteristics of the Included Studies.

<p>Summary of Characteristics of the Included Studies.</p