The prevalence of inflammatory bowel disease increased significantly among Americans aged 67 years and older from 2001 to 2018, based on data from more than 25 million Medicare beneficiaries.
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The worldwide prevalence – or rate of existing cases – of inflammatory bowel disease (IBD) increased from 3.7 million in 1990 to 6.8 million in 2017, wrote Fang Xu, PhD, of the Centers for Disease Control and Prevention, and colleagues. “As the prevalence increases with age group, it is important to understand the disease epidemiology among the older population,” they said.
In a study published in the Morbidity and Mortality Weekly Report, the researchers reviewed 2018 Medicare data for 25.1 million beneficiaries aged 67 years and older to assess prevalence trends overall and by race and ethnicity. Over the study period, the study population ranged from 23.7 million persons in 2009 to 25.6 million persons in 2018. The incidence – or rate of new cases – of IBD peaks at 15-29 years of age, but approximately 10%-15% of new cases develop in adults aged 60 years and older, so the prevalence of IBD overall is expected to increase over time with the aging of the U.S. population, the researchers said.
In this population of beneficiaries, 0.40% overall had a Crohn’s disease diagnosis and 0.64% had an ulcerative colitis diagnosis. The prevalence for both diseases was consistently highest among non-Hispanic Whites, the researchers noted. In addition, the prevalence of Crohn’s disease was highest among younger beneficiaries, while the prevalence of ulcerative colitis was highest among those aged 75-84 years. Other factors associated with higher IBD prevalence were female gender and residence in large fringe metropolitan counties.
The overall age-adjusted prevalence of Crohn’s disease increased over time with an annual percentage change (APC) of 3.4%, and the overall age-adjusted prevalence of ulcerative colitis increased with an APC of 2.8%. When the researchers examined subgroups of race and ethnicity, the annual increases were higher for non-Hispanic Blacks for both Crohn’s disease and ulcerative colitis, with APCs of 5.0% and 3.5%, respectively. “The potential rapid increase of disease prevalence in certain racial and ethnic minority groups indicates the need for tailored disease management strategies in these populations,” the researchers noted.
The study findings were limited by several factors including the lack of socioeconomic data, the potential for coding errors related to Crohn’s disease or ulcerative colitis, and the lack of generalizability to all older adults in the United States, the researchers noted. However, “Medicare data are a useful resource to monitor prevalence of IBD over time, understand its prevalence among older adults, assess differences by demographic and geographic characteristics, and have rich information to study health care use,” they concluded.
Consider the younger population
The data from the study need to be considered in the context of an accumulation of patients with IBD, and the distinction between incidence and prevalence, Stephen B. Hanauer, MD, of Northwestern University, Chicago, said in an interview.
Dr. Stephen B. Hanauer
The overall incidence of IBD is much greater in younger individuals (approximately ages 15-29 years) compared with older adults, he said. Patients with IBD don’t die of it; they grow old with it. Consequently, the prevalence in the Medicare population increases over time, he explained.
The data may be of interest to the practicing clinician, but would be most useful to hospital and Medicare administrators in terms of planning for an increase in the number of older adults surviving into older adulthood with IBD who will require care, he noted.
The researchers and Dr. Hanauer had no financial conflicts to disclose.