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We expected the seroprevalence to be an estimated 25% and for a 95% confidence interval of +/− 10% 15 35%%) we estimated the sample size of 300 from each age group in each of the three strata in each province for an expected sample size from each province of 4,500 and a total of 49,500 subjects.
Effect measure modification (EMM; modification of the risk ratio) was calculated as the ratio of the risk-ratios in the highest and lowest comorbidity strata in each categorization.
The interaction contrast (IC; modification of the risk difference) was calculated as the difference in risk-difference values between the highest and lowest comorbidity strata in each categorization.
Jerrett et al assessed onset of asthma in a sample of 217 children from 11 communities in southern California with an equal number of children from two strata in each community (above or below the median traffic exposure) [ 25].
We suggest using a regression model to predict RF-EMF exposure of the population strata suggested above (i.e. gender, age groups, type of residential area, workday vs. weekend, three socioeconomic levels, user of mobile and cordless phones and owning a WLAN at home) although it may not be possible to include all these strata in each future study.
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A subject was allowed to contribute to more than one stratum in each analysis.
Half of the teaching staff from each academic title stratum in each department were randomly selected and invited to participate in this study.
Our cluster bootstrap takes account of survey design by drawing a fixed number of clusters (the same as in the original data) from each stratum in each sample.
Water samples were collected and analysed from upper, middle and lower stratum in each reach from all study streams in 2002 and 2003.
After the stratification, we calculated the percentage of UAI at each stratum in each year, and we further performed trend test to check whether the percentage of UAI was changed in different stratums during the study period.
Urban and rural populations, which have distinct socioeconomic characteristics (Additional File 1), were sampled in a ratio of 1 1 (n = 1800 from each stratum in each region) in proportion to the overall age and sex distribution of each region.
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