Mapping and statistical analysis revealed substantial clustering and small-area variations in the prevalence of DM in the City of Winnipeg.
Many studies have shown that insomnia is a common problem among university students, but there are wide variations in the prevalence of insomnia.
To describe racial variations in the prevalence of refractive errors among adult white, Chinese, Hispanic, and black subjects in the United States.
Individual studies show variations in the prevalence of myopia and high myopia between regions and ethnic groups, and there continues to be uncertainty regarding increasing prevalence of myopia.
Therefore, differences among the sources of the food products and the environments in which they are processed may be the main reasons for the variations in the prevalence of ESBL-E.
When we kept incidence constant, variations in the prevalence of undiagnosed HIV infection had an impact on results (Figure 1).
The understanding of population genetic differentiation, especially in genes associated with diseases, can help to explain the observed variations in the prevalence of diseases.
The authors suggested that "variations in the prevalence of respiratory symptoms according to geo-climatic factors could provide important clues to the knowledge of the aetiology of asthma".
In an ecological analysis of geo-climatic variations in the prevalence of current asthma, allergic rhinitis and chronic cough, and phlegm in Italy, Zanolin et al. [4] found a negative correlation between asthma-like symptoms and geographical latitude.
Among the communities selected for the ZAMSTAR study, there are large variations in the prevalence of tuberculous infection, with substantially higher estimates in the SA communities than in the Zambian ones.
Variations in the prevalence figures have been attributed to methodological or population differences [ 9].
