Retirement may be death sentence for some
This is an example of a prospective study (see Unit 16 of theStatistics: Decisions through Data video available from the Australian Association of Mathematics Teachers Inc.) where a group is studied from a starting point over a period of time. It would appear from the report that of the 1779 men who lost employment the rate of death was twice as great as for the 4412 men continuously employed. The caveat in the seventh paragraph would seem to acknowledge that health problems may have contributed in some cases to retirement and to death. Unfortunately the "raised risk" when some factors were controlled for is not given. These are examples of potential lurking variables which could affect both retirement and death. Project work might find the original report and follow up some questions.
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