Population-Based Incidence of IDDM in the State of São Paulo, Brazil
- Sandra RG Ferreira, MD, PHD,
- Laercio J Franco, MD, PHD,
- Marco A Vivolo, MD,
- Carlos A Negrato, MD,
- Antonio CP Simoes, MD and
- Carlos R Ventureli, MD
- Department of Preventive Medicine, Escola Paulista De Medicina São Paulo; the Department of Pediatrics, Universidade Estadual de São Paulo, Botucatu, Brazil
- Address correspondence and reprint requests to Sandra R.G. Ferreira, MD, PHD, Escola Paulista de Medicina, Departamento de Medicina Preventiva, Rua Botucatu, 740 CEP 04023–062 São Paulo-SP, Brazil.
Abstract
OBJECTIVE To study the incidence of IDDM among children, infants to 14 yr of age, in the state of São Paulo, Brazil, 1987–1991.
RESEARCH DESIGN AND METHODS A prospective population-based register was established, using physician reports of newly diagnosed IDDM patients < 15 yr of age as the primary source of case identification and school surveys as the main secondary source. Data were collected according to the methods recommended by the Diabetes Epidemiology Research International group.
RESULTS Case ascertainment was estimated at 95.0, 92.8, and 98.8% complete for each of the three cities studied. The average annual IDDM incidence was 7.6/100,000 inhabitants (95% confidence interval, 5.6–9.7). We found a higher incidence rate in girls than boys.
CONCLUSIONS The incidence of childhood IDDM in a tropical region in South America (São Paulo, Brazil) is in the middle incidence range observed in developed countries throughout the world. Increased incidence of IDDM in girls compared with boys will be tested by the ongoing Brazilian incidence study being developed in 18 other centers across the country.
- Received September 2, 1992.
- Revision received January 28, 1993.
- Accepted January 28, 1993.
- Copyright © 1993 by the American Diabetes Association
