Fig. 2.
Age has both linear and quadratic associations with cognitive function. Effect sizes and estimated confidence intervals (beta ± 1.96 X SE) of age and age2 predictor variables for the additive (truncation) models for each cognitive task. Estimated confidence intervals that do not cross the line of null effect (x = 0) are statistically significant. For ease of interpretation and visualization, and to keep all variables on a similar scale, we converted the beta for the eye contact task to minutes