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Two controls were individually matched to each case on year of birth (in 5-year strata), year of diagnosis (in 4-year strata), registry region, and race/ethnicity.
Figure 2 shows a hypothetical and idealized implementation of the CM 1 2 counter-matched sampling for this study, within a matching stratum defined by year of birth (5-year strata), year of diagnosis (4-year strata), registry region, and race/ethnicity.
Two UBC controls were individually matched to each CBC case on year of birth (5-year strata), year of diagnosis (4-year strata), registry region and race, and counter-matched on RT (as designated by the cancer registry), that is, each triplet comprised two women who had received RT and one woman who had not.
Controls in the WECARE Study had unilateral breast cancer and were representative of the population at risk for developing a second primary breast cancer; eligible controls were individually matched to cases on year of birth (5-year strata), year of diagnosis (4-year strata), registry region, and race.
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Ghana was unable to achieve 2 FGDs in the registry participants' strata, and there was an error during recruitment whereby some women over the age of 51 were enrolled into some of the 4 community FGDs.
Seaside towns are built on strata upon strata of happy memories; a sort of emotional geology.
Secondary strata Ethnicity, gender Primary strata Age Secondary strata.
Control subjects were randomly selected from the Swedish population registry and were frequency-matched to cases by sex, age in 10-year strata, and place of residence.
Relative risk was estimated by Cox regression, taking attained age as the underlying time variable, and stratifying by cancer registry region of residence at recruitment (i.e. assuming equal coefficients across strata but with a baseline hazard unique to each stratum) (StataCorp., 2009).
In each community and within each of 10 strata defined by sex and 10-year age groups, a simple random sample was drawn from public registry office listings.
(The $180 Strata model is plastickier).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com