The study was carried out in Lombardy (Northern Italy), from 2002 to 2005. By using a stratified cluster sampling design, we recorded Basal Area, one hundred tree trunk diameters at breast height (DBH ...

Methods: A stratified random cluster sampling method was employed to select 1,478 elderly individuals aged 60 and above in Chinese. A questionnaire survey was conducted, which included the ...

Methods In a cross-sectional study with random stratified cluster sampling, 160 clusters were chosen from various districts proportionate to the population of each district in Tehran. Following ...

Methods A nationally representative survey of smoking was conducted in 2010 among 100 000 Chinese adults aged ≥18 years, using a multistage stratified cluster sampling method. Information on smoking ...

A multi-stage stratified cluster sampling method was used. In the first step, the city was divided into urban and rural administrative units, and schools were selected from three categories: primary, ...

Considering the stratified cluster sampling design of MCS study, weights to adjust for attrition between contacts at successive MCS sweeps and for missing accelerometer data were taken into account ...

Each mobile IP address was permitted only one submission. Participants were clinical nurses randomly selected from 16 cities in Anhui province through stratified cluster sampling. Two tertiary ...

A stratified cluster sampling method was adopted to recruit students aged 12–15 years in four grades from nine schools. We stratified by grade and took the class as a cluster, amounting to 639.

There are a variety of ways samples can be taken: Simple random (pull names from a hat) Systematic random (i.e., every 5th name) Stratified random (separate samples for each subgroup) Cluster sampling ...