Fig. 3.

Breakdown by age categories for reports providing intracranial volume and grey matter volume. Three plots display the breakdown of studies examining intracranial volume (ICV) and grey matter volume (GM) in the current literature across six age categories: ‘infant’ (0–1 years), ‘early childhood’ (2–6 years), ‘late childhood’ (7–17 years), ‘mature’ (18–59 years), ‘senior’ (60+ years), and ‘lifespan’ (any study covering more than 2 age ranges): (a) the total number of articles providing ICV in each age category; (b) the sum of the total number of male and female participants included in those age categories; and (c) displays the weighted mean volumes of ICV and weighted error bars for males and females across all age categories. (d) The total number of articles providing GM in each age category; (e) the sum of the total number of male and female participants included in those age categories; and (f) displays the weighted mean volumes of GM and weighted error bars for males and females across all age categories.