Seasonal variation in incidence rates of juvenile-onset, insulin-dependent diabetes, and the relationship to a family history of diabetes

Seven hundred and thirty-six cases of juvenile-onset, insulin-dependent diabetes mellitus were studied, to investigate a possible relationship between seasonal incidence rates and a family history of diabetes mellitus of either type. Seasonal incidence was significantly affected by the presence or absence of a family history of diabetes of either type. Seasonal variation was present to a significant degree (p