In order to study the relevance of the influence of environmental factors in Insulin-dependent Diabetes, we dressed a statistical analysis of season-related diabetes (Roger's test and Wallenstein's test). At the same time, we made a statistical analysis of space-time clusters of IDDM patients (Knox method and Mantel method). We noted an illness increase between August and February, although not significantly. The Wallenstein test clearly shows the existence of several significant season-related symptoms. As for the space-time clustering tests, and taking into account the relatively short duration of these environmental factors none in fact allows to assert the existence of such influences.