Ten-Year Longitudinal Study of Children at High Risk of Insulin-Dependent Diabetes Mellitus

Abstract
To the Editor: The frequency of Type 1 diabetes, or insulin-dependent diabetes mellitus (IDDM), in the general population is about 1 in 600.1 In contrast, in families in which one child has IDDM, the likelihood that another child will have IDDM is about 100 times higher.2 This latter high-risk population seemed an ideal group in which to identify some of the factors that might precede the development of clinically apparent IDDM.In 1977 we initiated a long-term longitudinal study of families in which one child had IDDM.3 , 4 When a proband was identified and the family was entered in the study, . . .