PREVALENCE OF NIDDM AND IMPAIRED GLUCOSE-TOLERANCE IN A RURAL AND AN URBAN-POPULATION IN CAMEROON

The adoption of Western lifestyles is known to lead to increasing prev alence of non-insulin-dependent diabetes mellitus in Africa, yet epide miological studies using standardised methods are rare. The prevalence of diabetes and impaired glucose tolerance was determined in a rural and an urban community in Cameroon using the 75-g oral glucose toleran ce test and the World Health Organization diagnostic criteria in 719 r ural (292 men, 427 women) and 1048 urban (458 men, 590 women) subjects aged 24-74 years. The response rate was 95 and 91 % for the rural and urban population, respectively. The age-standardized prevalence of di abetes in the rural and urban population was respectively 0.9 % (95 % confidence interval (0.2-2.7)) and 0.8 % (0.2-1.8) for men and 0.5 % ( 0.1-1.6) and 1.6 % (0.7-3.1) for women, and that of impaired glucose t olerance was 5.8 % (3.3-9.4) and 1.8 % (0.9-3.2) for men, and for wome n, 2.2 % (1.0-4.0) and 2.0 % (0.6-4.5). Although for both men and wome n the body mass index was higher at all ages in the urban than in the rural area, the 2-h plasma glucose, even after adjustment for age and body mass index, was significantly higher in the rural than in the urb an area (p < 0.005, p < 0.002 for men and women, respectively). There was a female excess of diabetes in the urban area and an equal sex dis tribution in the rural area. In the rural area 67 % (4 of 6) of diabet ic subjects were unknown before the survey, compared with 57 % (8 of 1 4) in the urban area. These data indicate a low prevalence of diabetes in Cameroon; however, the prevalence of impaired glucose tolerance su ggests an early stage of a diabetes epidemic.