Patama VapattanawongPramote PrasartkulMahidol University2018-05-032018-05-032011-11-01Bulletin of the World Health Organization. Vol.89, No.11 (2011), 806-81215640604004296862-s2.0-80055113908https://repository.li.mahidol.ac.th/handle/20.500.14594/12227Objective To estimate the magnitude of under-registration of deaths, by age and sex, in Thailand. Methods The data in this study were derived from two sources: the Thai Survey of Population Changes (SPC) 2005-2006, a consecutive multi-round household survey conducted over a 12-month period, and Thailand's vital registration records. SPC death entries for people of all ages were matched to 2005-2006 death records from vital registration. The principles of a dual records system were applied to estimate the magnitude of under-registration of deaths, classified by age and sex, using the Chandrasekaran-Deming formula. Findings Overall under-registration of deaths during 2005-2006 was 9.00% (95% confidence interval, CI: 8.95-9.05) for males and 8.36% (95% CI: 8.31-8.41) for females. For both males and females, under-registration decreased as age increased. Under-registration was greatest among people of either sex aged 1-4  years, whereas it was < 10% among people 60 years of age and older, both males and females. Conclusion These findings provided correction factors that can be used for adjusting mortality data from the registration system.Mahidol UniversityMedicineArticleSCOPUS10.2471/BLT.10.083931