HLTC22H3 Chapter 1: Chapter 1

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12 Jan 2012
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Period refers to the time at which the measurement or assessment occurred. If a particular phenomenon always changes with age, regardless of cohort or period, then it is an age effect. If the change is specific to a particular cohort but does not occur in any other group, then it is a cohort effect. If all cohorts or ages change at a particularly point in time, then it is a period effect. y y life span refers to the absolute length of time a member of a given species y may live. In humans, that is currently about 120 years. In contrast, life expectancy refers to the length of time an average member of a particular cohort can except to live.

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