The reason for drawing cases and controls from the same area is, of course, to minimize potential differences other than the factor under study (i.e., arsenic).
Drawing cases and controls from the same area, however, may also reduce the difference in arsenic exposure, requiring a larger sample size to determine whether an excess risk exists for a given exposure.
Thus, we included 37,401 children (90%) in the final cohort from which we drew cases and controls.
The UKO study (269 controls2 controls) drew cases from 10 gynaecologic oncology National Health Service Centers and apparently healthy controls from the UK Collaborating Trial of Ovarian Cancer Screening (UKCTOCS).
In order to be relevant to a broad international audience, the course draws case studies and presentations from Brazil, Czech Republic, India, Morocco, Pakistan, Palestine, US, UK and other countries.
The UTS is also plotted as a function of GNS volume fraction both for as-prepared and drawn case in Fig. 6b.
Focuses on the integration of land use and transportation planning, drawing from cases in both industrialized and developing countries.
Daily total draw cases for a gas heat pump of 243, 303 and 379 L compared to a non-condensing gas storage unit as the base case show payback periods of 4, 3.2 and 2.5 years, respectively.
The proportions were similar for different blood draws among cases and non-cases.
The authors, drawing on case examples from the Nigerian PHC system, finely etch these intricacies of people-centric governance.
Venous blood samples were drawn from cases and controls, and total plasma homocysteine (tHcy) was determined.
