Change In Years Of Life Lost Due To Premature Death Of Gastric Cancer After Correcting For Misclassification Of CausesOf Death In Iran’s Death Registry 2006-2010, Using Bayesian Method

For evaluating health status of a country and determining priority of risk factors, someepidemiological indicators are needed. One of the most widely used indicators is Years of life lost(YLL) due to premature death. To have an exact estimate of YLL, an accurate death registry data isneeded but based on the report of Iranian death registry, about 20% of deaths are registered inmisclassified groups. The aim of this study is to estimate the change in years of life lost due togastric cancer mortality after correcting for misclassification in registering causes of death usingBayesian For this study gastric cancer data for years 2006 to 2010 for Iran were extracted fromnational death statistics. Rate of misclassification in registering causes of deaths due to gastriccancer in cancer without label group, was estimated using Bayesian method for each year. Years oflife lost due to gastric cancer is estimated before and after Bayesian correction. Using Bayesianmethod, misclassification rate for gastric cancer in cancer without label group were estimated to be5%, 3%, 3%, 7% and 7% respectively for years 2006 to 2010. Estimated Years of life lost due to gastriccancer before correcting misclassification were respectively 111684.93, 114957.31, 112391.93,112250.53 and 113300.92 person-years for years 2006 to 2010. After correcting misclassification,YLL of gastric cancer increased 1535.19, 921.11, 908.39, 2566.39 and 2507.00 person-years,respectively for years 2006 to 2010. If health policy makers ignore the existence of misclassificationin registered causes of death they may underestimate the cause specific burden of disease andconsequently programming for cancer control and prevention will done erroneously.