WHO estimates on MDR-TB are based exclusively on population-based surveys, such as those recently conducted in Nigeria and Senegal.
Web-based surveys, such as WageIndicator and Glassdoor, have already been introduced in the first sections of this article.
Population-based surveys, such as the Demographic and Health Surveys (DHS), are usually sponsored by donors.
CPR estimates have historically been collected every 5 years through population-based surveys, such as the Demographic and Health Surveys (DHS).
The other limits are related to the possible biases occurring in the population-based surveys, such as information and recall bias.
Probability-based surveys such as cluster surveys can estimate vaccination coverage even if the size of the target population is not known [ 19, 20].
Despite the obvious importance of obstetric complications in stimulating care-seeking, its role is rarely investigated, probably "in part because population-based surveys such as the DHS typically do not collect sufficiently detailed information to permit such an investigation" [ 12].
These data stand in contrast to data from the developed world, where large population-based surveys such as the NHANES have shown the prevalence of CKD to be about 12-20% [ 11- 13].
The two main sources of vaccine coverage data are periodic population-based surveys, such as Demographic and Health Surveys (DHS) and Mixed Indicator Cluster Surveys, and routine administrative reports.
Population-based surveys such as NHANES, a program of the Centers for Disease Control and Prevention CDCC), provide information about the distribution of many environmental chemicals in the U.S. population (NHANES 2005).
