Prevalence Is A Point Based Estimate Essay
Yes: Studying the 85,474 persons identified by the prevalence survey in a resource poor setting is unrealistic. A case-control study can match cases and controls by age and sex, which have been issues in previous studies. Less expensive and time-consuming than including everyone. Information on biomass fuels is difficult to obtain. Testing for Tb can be expensive.
“…all persons in the selected villages/units were registered via door-to-door census”.1 Cases were selected from a population-based study and confirmed by positive sputum smears/positive culture. Controls were selected from the same population-based survey.
Controls came from the same survey and village as cases – if they had Tb, they would have been cases. All households were included in the survey and as controls were selected…