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The Social Security Death Index was used to determine survival status of the patients.Twenty-six percent of the patients had severe angiographic disease, and the annual mortality rate for the population was 2%.
Because many of the people who bought industrial life policies did so before the Social Security program was created, in 1935, no Social Security number was ever written on their policy and the master death index was not a good place to find out whether any of them had died.
For some patients, whose death occurred outside the hospital, the Social Security Death Index was linked to the database for investigations related to mortality.
All-cause mortality, ascertained by social security death index, was used as the primary endpoint.
The cell death index was then determined using our established method.
The SS Death Index was accessed at the end of study data collection.
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The National Death Index is checked annually to ascertain deaths.
Pancreatic cancer deaths ascertained using the US National Death Index were also counted as cases.
The date of death and cause of death in the National Death Index were derived from death certificates.
The computerised National Death Index is a highly sensitive method for identifying death in this cohort (Stampfer et al, 1984).
Likewise, the linkage with the Australian National Death Index is validated and mortality ascertainment data are likely to be complete.
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