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Suggested answer to exercise: survival after retirement, 5

Question 5. Why do they say that employees who retired at 55 and were still alive at 65
had significantly higher mortality than those who retired at 65, when no P value is given?

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Suggested answer

The difference is significant at the 0.05 level because the
95% confidence interval for the hazard ratio, which is 1.09 to 1.73, does not include 1.00.
This is the value the hazard ratio for the population would have
if the null hypothesis were true.

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Last updated: 31 July, 2009.

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