Incidence, seasonal and geographical patterns of juvenile-onset insulin-dependent diabetes mellitus in Denmark

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Abstract
The incidence, sex, seasonal and geographical patterns of juvenile-onset insulin-dependent diabetes mellitus (j.i.d.m.) were studied retrospectively on one third of the Danish population 1970–1974. The j.i.d.m. incidence remained fairly constant during the study period, the average being 13.2 per 100000 per year. The total number of boys exceeded the number of girls by 27 per cent. A marked peak of incidence was found at 12–14 years, earlier for females than for males. A seasonal variation in onset (diagnosis) of j.i.d.m. was observed with the lowest number of new cases in May–July. The j.i.d.m. incidence seemed to show socioeconomic differences, being highest in those parts of the survey area with lower status.