Fig. 1From: Regression to the mean in latent change score models: an example involving breastfeeding and intelligenceMaternal IQ frequency distribution, separately for first (A) and second (B) child and for those who breastfed (darker gray) or did not breastfeed (lighter gray) the child. Due to the scaling of the original variable (percentile from 0 to 100 with M = 42 and SD = 29), the range was restricted to 77.5–131Back to article page