While the community member stratification was meant to be representative, those who chose to participate or were available to participate may not represent the full spectrum of health care beliefs.
The identical two-stage sampling procedure consisted of 1) drawing a sample of 51 out of 651 communities after stratification according to their size and 2) drawing the subjects from the population files of the communities (resident population aged 25-74 years in Vaud/Fribourg and aged 35-64 in Ticino; for details see [ 7]).
Yet for about 20 years or so, researchers within the social stratification community have undertaken several cross-national studies.
Our molecular analysis of bacterial and archaeal community structure and stratification has focused on the level of gene expression via RNA, not gene presence via DNA.
We used a stratified random sampling of private Inuit households, with the community being the stratification variable.
However, this is comparable to uptake rates of colorectal cancer screening, 25 26 and greater than other community liver disease stratification studies, where screening uptake is explicitly reported.
This is also in line with the growing interest in the medical community for risk-stratification based on multivariable evaluation.
The community was the only stratification variable used.
The structure and development of mature biofilms is correlated to emergent biological properties of the adherent microbial community, such as metabolic stratification (7), antimicrobial resistance (8, 9), active dispersal processes (10) and virulence (11).
In all other countries, the samples were drawn using different ways of clustering (regions, communities, schools or households) and stratification (e.g. region, community size, sex, age, social class).
