Extended Data Fig. 9: Ascertainment of outcomes and exposures from the National Patient Register (NPR).
From: Parental inflammatory bowel disease and autism in children
a, Diagnostic codes for ascertainment of outcomes and exposures. b, Frequency of IBD diagnoses, by year, in NPR for study cohort mothers from 1987 to 2010. c, Frequency of IBD diagnoses, by year, in NPR for study cohort fathers from 1987 to 2010. ICD-9: International Classification of Diseases – ninth edition; ICD-10: International Classification of Diseases – tenth edition.
