The annual incidence of both types 1 and 2 diabetes markedly increased among youths between 2002 and 2012, especially among those in minority racial and ethnic groups, according to a report published online April 13 in the New England Journal of Medicine.
Researchers analyzed trends in diabetes incidence in the observational Search for Diabetes in Youth study, which conducts annual population-based case ascertainment of the disease in people aged 0-20 years. SEARCH is funded by the Centers for Disease Control and Prevention and the National Institute of Diabetes and Digestive and Kidney Diseases.
In this analysis of SEARCH data, there were 11,245 youths with type 1 diabetes in 54,239,600 person-years of surveillance and 2,846 with type 2 diabetes in 28,029,000 person-years of surveillance.
“We estimated that approximately 15,900 cases of type 1 diabetes were diagnosed annually in the U.S. in the 2002-2003 period, and this number increased to 17,900 annually in the 2011-2012 period. Overall, the adjusted annual relative increase in the incidence of type 1 diabetes was 1.8%,” noted Elizabeth J. Mayer-Davis, PhD, of the departments of nutrition and medicine, University of North Carolina, Chapel Hill, and her associates (N Engl J Med. 2017 April 13. doi: 101056/NEJMoa1610187).
Similarly, they estimated that approximately 3,800 cases of type 2 diabetes were diagnosed in the first year of the study, increasing to 5,300 in the final year. The annual relative increase in type 2 diabetes was 4.8%.
The rate of increase varied across the five major ethnic groups studied: non-Hispanic whites, non-Hispanic blacks, Hispanics, Asians or Pacific Islanders, and Native Americans. Type 1 diabetes incidence rose rapidly among Hispanic youths, and type 2 diabetes rose rapidly in all racial and ethnic groups other than whites, with the greatest rate of increase among Native Americans.
These increases suggest “a growing disease burden that will not be shared equally” because of differences among ethnic groups in barriers to care, methods of treatment, and clinical outcomes. “These findings highlight the critical need to identify approaches to reduce disparities among racial and ethnic groups,” Dr. Mayer-Davis and her associates noted.
The National Institute of Diabetes and Digestive and Kidney Diseases and the Centers for Disease Control and Prevention funded the study. Dr. Mayer-Davis reported having no relevant disclosures. One of her associates reported serving as a consultant to Denka-Seiken and MedTest DX.