First, the control population used in the previous work was based on the literature and second, comparisons in the previous work were based on prevalence in the whole group rather than those prevalent in age and sex stratified groups.
By contrast, cost ratios were below one in post-MDA settings, suggesting that classifying districts based on prevalence estimates was more cost-effective than using the TAS decision rule (Table 5).
Based on prevalence surveys conducted in the USA in 1988–1991, about one-third of adults had evidence of H.pylori infection (48).
Sample size calculations were conducted using Epi Info Version 5 based on prevalence estimates for primary outcomes derived from a population-based Victorian survey of recent mothers [ 16].
A sample size estimate was calculated based on prevalence data from then preliminary results of a community-based study with Iraqi refugees in Sydney.
Second, a government panel of scientists should designate the highest-priority ailments based on prevalence, years of life lost and cost to the economy.
To present a predictive model of alcohol abuse among adolescents based on prevalence projections in various population subgroups.
Disease onset based on prevalence data; mortality from life tables.
Studies based on prevalence and distribution of hypodontia demonstrated a high variability depending on sample size, gender, race, and ethnic provenance [1, 8 10, 12, 13].
Based on prevalence and mortality, the serous carcinoma is the most important, representing nearly 40% of all primary ovarian carcinomas with an overall five-year survival rate of approximately 30%.
The readers assessed the image quality subjectively based on prevalence of noise, contrast between different tissues and organs (e.g. differentiation between the lung and thoracic wall) and lesion detectability.
