Seasonal variation in month of diagnosis in children with type 1 diabetes registered in 23 European centers during 1989-2008: little short-term influence of sunshine hours or average temperature

Background The month of diagnosis in childhood type 1 diabetes shows seasonal variation. Objective We describe the pattern and investigate if year-to-year irregularities are associated with meteorological factors using data from 50 000 children diagnosed under the age of 15 yr in 23 population-based European registries during 1989–2008. Methods Tests for seasonal variation in monthly counts aggregated over the 20 yr period were performed. Time...