Diabetes, Vol 37, Issue 8 1096-1102, Copyright © 1988 by American Diabetes Association
Incidence of IDDM in Montreal by ethnic group and by social class and comparisons with ethnic groups living elsewhere
J Siemiatycki, E Colle, S Campbell, R Dewar, D Aubert and MM Belmonte
Center of Research on Epidemiology and Preventive Medicine, Institut Armand-Frappier, Laval-des-Rapides, Quebec, Canada.
We examined the incidence of insulin-dependent diabetes mellitus (IDDM)
among children aged 0-14 yr in Montreal by social class and by ethnic group
from 1971 to 1985. There was a slightly higher risk in wealthier as opposed
to poorer classes. This income gradient was more marked in younger than in
older children. Children of French extraction had about two-thirds the risk
of IDDM of children of other origins, mainly British and other European.
This mimics the patterns of risk in Europe, where France is reported to
have lower rates than does Britain and Scandinavia. The absolute levels of
risks among French Canadian and Jewish Canadian children were about double
those reported from France and Israel, respectively. These various results
are compatible with the hypothesis that both genetic and environmental
factors influence IDDM risk.