Fig. 1

Longitudinal association of birth by C-section and the Mental (A) and Psychomotor (B) Development Indices of the Bayley Scales of Infant Development, 2nd Edition, by child’s age in the ELEMENT study (N = 1402, births by C-section = 26.9%). Models adjusted for prematurity, child’s sex, maternal age, IQ, schooling, marital status, and calendar time. The Y-axis represents the adjusted difference of BSID composite scores between birth modes; values below 0 indicate lower development scores in C-section-born children.