Left Truncation, Susceptibility, and Bias in Occupational Cohort Studies
نویسندگان
چکیده
منابع مشابه
Bias due to left truncation and left censoring in longitudinal studies of developmental and disease processes.
In longitudinal studies of developmental and disease processes, participants are followed prospectively with intermediate milestones identified as they occur. Frequently, studies enroll participants over a range of ages including ages at which some participants' milestones have already passed. Ages at milestones that occur prior to study entry are left censored if individuals are enrolled in th...
متن کاملBias in occupational epidemiology studies.
The design of occupational epidemiology studies should be based on the need to minimise random and systematic error. The latter is the focus of this paper, and includes selection bias, information bias and confounding. Selection bias can be minimised by obtaining a high response rate (and by appropriate selection of the control group in a case-control study). In general, it is important to ensu...
متن کاملSelection bias in occupational sperm studies.
Participation rates in sperm studies are typically 25-50%, and therefore it is a matter of concern whether the men who provide semen samples truly reflect the parent population. The authors analyzed data from three Danish occupational sperm studies and evaluated the relation between age and occurrence of subfertility to participation and provision of semen samples. Age and subfertility were fou...
متن کاملBias From Using Occupational Smoking Prevalence to Adjust Occupational Incidence Cohort Lung Cancer Mortality Rates
OBJECTIVE To describe how smoking correction factors based on comparing worker smoking prevalence with population smoking prevalence are biased if applied to an occupational incidence cohort. METHODS Relative rates of smoking for shorter-tenure workers derived from occupational cohort lung cancer studies were applied to incidence and prevalence population tenure distributions to calculate rel...
متن کاملLeft Truncation Bias as a Potential Explanation for the Protective Effect of Smoking on Preeclampsia
BACKGROUND We carried out a study to examine whether left truncation bias could explain the negative association between smoking and preeclampsia. METHODS Monte Carlo and other simulation models were used to determine the effect of differential rates of early pregnancy loss among smokers on the relation between smoking and preeclampsia at ≥20 weeks' gestation. Assumptions included no associat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Epidemiology
سال: 2011
ISSN: 1044-3983
DOI: 10.1097/ede.0b013e31821d0879