Fig. 5

Age of achievement of milestones ‘walking independently and ‘using two-word sentences’ for the total group. Dark grey bars represent the number of children (x axis) that were not able to perform these milestones at that age (y axis). Light grey bars display the number of children who could perform these milestones at that age. Hatched bars represent children who could not perform the milestones but had not yet reached the age displayed on the y axis and children who are able to perform the milestones but for whom it is not known whether they had achieved them at the age on the y axis. In the top bar “All”, the light grey bar represents all the children who achieved the milestone, including those for whom the age of achievement is not known and the hatched bar represents children who have not yet achieved the milestone (but these children were all 4 years or younger)