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For example, using death registries to obtain causes for death is a notoriously invalid source for this type of information.
Second, besides the more usual registry linkages to obtain causes of death and cancer incidence, the additional medical data from general practitioners (diagnoses, prescriptions and referrals) enable us to study other recorded health outcomes, for which other cohort studies mostly rely on self-reported questionnaire data that are prone to reporting and recall bias and selective loss to follow-up.
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Verbal autopsy is an approach used to obtain cause of death by interviewing lay respondents on the signs and symptoms experienced by the deceased before death [8].
The numbers of deaths in each five-year period were too small to obtain cause-specific SMRs.
Further, demographic surveillance often utilise VA to obtain cause-specific mortality data in the population under surveillance.
Some non-differential misclassification might also have been introduced by the probabilistic record linkage, which was used to obtain cause-of-death information.
Since the relatively small numbers of deaths in each category did not make it meaningful to obtain cause-specific SMRs for each time period, it was not possible to investigate how cause-specific mortality ratios change over time.
Participants in these three studies were followed passively from date of PCa diagnosis via linkage to the Victorian Registry of Births, Deaths, and Marriages (VRBDM), and the National Death Index (NDI), both of which obtain cause of death data from the Australian Bureau of Statistics.
Due to a paucity of statistics from vital registration systems in developing countries, the verbal autopsy (VA) approach has been used to obtain cause-specific mortality data by interviewing lay respondents on the signs and symptoms experienced by the deceased prior to death.
To obtain cause of death, the names of cohort members who were known to have died in the study period were matched with the NYSVR Death Certificate Registry (NYSDCR) and, if they died out of state, with the National Death Index (NDI) of the National Center for Health Statistics (Hyattsville, MD).
Furthermore, NDI is a validated method for matching deaths in the U.S. to population-based datasets and for obtaining cause of death [77].
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