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. 2023 May 4;10(1):e001037. doi: 10.1136/bmjgast-2022-001037

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Age-standardised and sex-standardised incidence rates of non-Hodgkin's lymphoma (panel A) and Hodgkin’s lymphoma (panel B). The Norwegian background population of 1987 was used as reference. Panel A: the peak in 1997 in Sweden was due to cases of lymphoma in strata with few patients with inflammatory bowel disease (IBD). Moreover, the number of patients with incident IBD was artifactually low before 2001, when outpatient records became available in the Swedish Patient Register (online supplemental figure 2). Panel B: the figure is based on 14 cases in Norway and 29 cases in Sweden. The increased rates in 2002 and 2003 in Norway were due to two cases in strata with very few patients with IBD.