Selection Bias Due to Loss to Follow Up in Cohort Studies
نویسندگان
چکیده
منابع مشابه
Bias due to incomplete follow up in a cohort study.
AIM To investigate the bias introduced by incomplete follow up in a cohort study of ocular outcome after premature birth. METHODS A geographically defined cohort of children born before 32 weeks' gestation was prospectively recruited at birth to study the ocular outcome at 2 years. On the basis of attendance at 2 years, the children's families were allocated to one of three groups: group 1 at...
متن کاملLoss to follow-up in cohort studies: bias in estimates of socioeconomic inequalities.
BACKGROUND Although cohort members tend to be healthy and affluent compared with the whole population, some studies indicate this does not bias certain exposure-outcome associations. It is less clear whether this holds when socioeconomic position (SEP) is the exposure of interest. METHODS As an illustrative example, we use data from the Avon Longitudinal Study of Parents and Children. We calc...
متن کاملQuantifying and Adjusting for Disease Misclassification Due to Loss to Follow-Up in Historical Cohort Mortality Studies
The purpose of this analysis was to quantify and adjust for disease misclassification from loss to follow-up in a historical cohort mortality study of workers where exposure was categorized as a multi-level variable. Disease classification parameters were defined using 2008 mortality data for the New Zealand population and the proportions of known deaths observed for the cohort. The probability...
متن کاملEstimating bias from loss to follow-up in a prospective cohort study of bicycle crash injuries
BACKGROUND Loss to follow-up, if related to exposures, confounders and outcomes of interest, may bias association estimates. We estimated the magnitude and direction of such bias in a prospective cohort study of crash injury among cyclists. METHODS The Taupo Bicycle Study involved 2590 adult cyclists recruited from New Zealand's largest cycling event in 2006 and followed over a median period ...
متن کاملLoss to follow-up
Why do these situations make a difference? Because in each situation, those lost to follow-up often have a different prognosis than those who complete the study. For example, patients who receive treatment for cervical myelopathy may not return for follow-up because they became asymptomatic and felt no need to return to see the surgeon. Conversely, some patients may not return because they had ...
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ژورنال
عنوان ژورنال: Epidemiology
سال: 2016
ISSN: 1044-3983
DOI: 10.1097/ede.0000000000000409