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The survey applied a multistage probability cluster design.
Participation in NHANES is voluntary and confidential, and follows a complex, multistage, probability cluster design.
Households were selected by using a stratified, multistage probability cluster sampling.
The NHANES is a stratified, multistage, probability cluster survey conducted in the noninstitutionalized U.S. population (8).
The sample was collected using a stratified, multistage, probability cluster design.
These surveys have used a stratified, multistage probability cluster design to provide data representing the noninstitutionalized U.S. population (NCHS 2004a).
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A multistage probability clustered sampling design was used to obtain its Wave I sample.
The sampling protocol for the KNHANES was designed to involve a complex, stratified, multistage, probability-cluster survey of a representative sample of the non-institutionalized civilian population in Korea.
The NHANES III, conducted during the 1988-1994 perisd, is a nationally representative cross-sectional study using a stratified, multistage, and probability cluster design [ 20].
The NHIS, one of the oldest US national health surveys, has a complex multistage probability design that uses clustering and stratification with oversampling of selected population subgroups [ 10, 11].
NHANES III was a cross-sectional, stratified, clustered, multistage probability sample survey of the civilian, noninstitutionalized U.S. population, conducted by the National Center for Health Statistics (NCHS) between 1988 and 1994 [ 18, 19].
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