Friedman et al. (1993) analysed data from the longitudinal Terman Life-Cycle Study and found that those rated the highest in cheerfulness "had significantly higher death rates" than others.
The Terman study is the longest longitudinal research to ever include numerous repeated assessments. The current study was limited to participants with data on child personality traits and midlife health information.
The key feature of the Terman Life-Cycle Study are-
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