The prevalence of hypertension in rural and urban Cameroon.

BACKGROUND: The quickening pace of change and adoption of western lifestyles by people in developing countries has led to a sharp rise in the incidence of hypertension. Yet epidemiological studies using validated methods are rare especially in Central Africa. METHODS: The prevalence of hypertension, according to the World Health Organization definition (systolic blood pressure [SBP] > or = 160, diastolic [DBP] > or = 95 mmHg), was estimated by a population-based survey in 1798 Cameroonian subjects aged 25-74 years. There were 746 individuals from a rural area (308 men, 438 women) and 1052 (461 men, 591 women) from an urban area. RESULTS: The response rate was 95% and 91% for the rural and urban populations respectively. The age-standardized prevalence of hypertension was significantly higher in the urban than in the rural area. It was 16.4% (95% CI: 11.6-21.2) in urban men and 12.1% (95% CI: 7.9-16.2) in urban women, while it was 5.4% (95% CI: 2.9-8.0) in rural men and 5.9% (95% CI: 3.8-8.0) in women. Borderline hypertension (SBP 140-160, DBP 90-95 mmHg) was detected in 7.4% (95% CI: 4.4-10.4) and 6.6% (3.1-10.2) of urban, and 7.3% (95% CI: 4.7-9.9) and 2.9% (95% CI: 1.5-4.4) of rural men and women respectively. CONCLUSIONS: These results indicate that hypertension is still uncommon in rural Cameroon but occurs frequently in the urban community, reaching a proportion comparable with industrialized urban communities.

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 prevalence of non-insulin-dependent diabetes mellitus in Africa, yet epidemiological 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 tolerance test and the World Health Organization diagnostic criteria in 719 rural (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 diabetes 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 tolerance was 5.8% (3.3-9.4) and 1.8% (0.9-3.2) for men, and for women, 2.2% (1.0-4.0) and 2.0% (0.6-4.5). Although for both men and women 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 urban 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 distribution in the rural area. In the rural area 67% (4 of 6) of diabetic subjects were unknown before the survey, compared with 57% (8 of 14) in the urban area. These data indicate a low prevalence of diabetes in Cameroon; however, the prevalence of impaired glucose tolerance suggests an early stage of a diabetes epidemic.