highly significantp < 0.0001
When analyzed with respect to postnatal age, there were highly significant group differences in FB size between on-time and advanced births ( F (1,81) = 69.06, p < 0.0001; Fig. 4 A , left), as well as between on-time and delayed births ( F (1,60) = 56.91, p < 0.0001; Fig. 4 B , left).