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To correct for unreported mortality among patients lost to follow-up, the updated vital status among lost patients for whom civil identification numbers were available was used to represent outcomes among all those lost to follow-up by generating a probability weighting (the ratio of all patients lost to follow-up to those lost for whom civil identification numbers were available).
For patients who had not been seen in the last 2 years, updated vital status was obtained from the hospital medical records department.
Due to limited follow-up, physicians were contacted 6 months after the original data collection to obtain updated vital status; KM analyses were used to estimate the OS rates using the updated information.
In the present study, we used these serum dioxin evaluations to develop historical TCDD exposure estimates for all TCP and 2,4,5-T workers, updated vital status from the previous study, and evaluated the risk of cancer and noncancer mortality with regard to TCDD exposure levels.
The current study updated vital status, examined liver and rectal cancer mortality previously reported in excess in this cohort and evaluated mortality from non-Hodgkin's lymphoma (NHL) and cancers of the stomach, intestine, breast, prostate, skin (melanoma) and brain reported to be in excess in other cohort and case-control studies of PCB-exposed persons.
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Regularly update vital information.
Each SEER registry routinely updates vital status and follow-up information for all patients with cancer.
Trained local field workers collect and update vital events (births, deaths, and migration) on a yearly basis since 1992.
The cohort of cleanup workers was linked to the EPR to update vital status (emigration or death with corresponding date), ethnicity and education.
HDSSs capture information on residence, update vital events and cover the whole or part of a district where data on all individuals, their relationships, ages as well as other attributes, are recorded longitudinally along with events affecting population dynamics including births, deaths and migrations (in and out) (1, 2).
DNA samples were genotyped using the Affymetrix 500KEA, 500K, and 5.0 arrays with protocols described in [ 4]. enrolled families enriched for longevity via 4 field centers (Boston, New York, and Pittsburgh in the USA, and Denmark) between 2006 and 2009 and participants are followed annually to update vital, medical and functional status.
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