Bias in Full Cohort and Nested Case-Control Studies?
نویسندگان
چکیده
منابع مشابه
Sampling strategies in nested case-control studies.
A stratified version of nested case-control sampling which we call "countermatching" is presented. This design uses data available for all cohort members to obtain a sample for collecting additional information in a case-control substudy. Hitherto the only stratified sampling design for such studies has involved matching of controls to cases with respect to confounding variables. However, in so...
متن کاملCohort and Case-control Studies
Cohort and case-control methodologies are the main tools for analytical epidemiological research. Other important types of epidemiological studies mainly for generating hypotheses include cross-sectional and ecological, or correlation studies. The conclusions that can be drawn from findings of these types of studies are, however, much weaker compared to those of cohort and case-control studies....
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OBJECTIVES To evaluate total and cause-specific mortality among hardmetal production workers with emphasis on lung cancer. METHODS Subjects were 7304 workers ever employed in one of eight US plants from 1952 to 2008. Vital status through 2012 was determined for 97% of subjects and cause of death for 98.3% of 1087 deaths. We computed standardized mortality ratios (SMRs) and evaluated exposure-...
متن کاملMortality Among Hardmetal Production Workers: UK Cohort and Nested Case-Control Studies.
OBJECTIVE The aim of this study was to characterize the mortality at two hardmetal production factories in the United Kingdom as part of an international study. METHODS Standardized mortality ratios (SMRs) were calculated on the basis of mortality rates for England and Wales, and local rates. A nested case-control study of lung cancer was undertaken. RESULTS The cohort comprised 1538 worker...
متن کاملAnalysis of Clinical Cohort Data Using Nested Case-control and Case-cohort Sampling Designs
K. Ohneberg1,2; M. Wolkewitz1,2; J. Beyersmann3; M. Palomar-Martinez4,5; P. Olaechea-Astigarraga6; F. Alvarez-Lerma7; M. Schumacher1 1Institute for Medical Biometry and Statistics, Medical Center University of Freiburg, Freiburg, Germany; 2Freiburg Center for Data Analysis and Modelling, University of Freiburg, Freiburg, Germany; 3Institute of Statistics, Ulm University, Ulm, Germany; 4Hospital...
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ژورنال
عنوان ژورنال: Epidemiology
سال: 2009
ISSN: 1044-3983
DOI: 10.1097/ede.0b013e31819ec966