Extended Data Fig. 2: Prevalence and overlap in diagnoses among the mothers included in the present study.

Overall prevalences of Crohn’s, UC, and other IBD diagnoses are shown in terms of mothers diagnosed (j) as well as children born to those mothers and followed up for autism in Study 1 (index persons, i). Overlap in the diagnoses is only shown for index persons included in the study, to align with values in Table 2 in the main text, though the extent of overlap is virtually identical if mothers or index persons are displayed. For example, of the 7,000 mothers diagnosed with Crohn’s, 1984 (28.4%) were also diagnosed with colitis, and the analogous proportion of children is 28.0% (3,466/12,390).