HLTHAGE 1BB3 Lecture : Health and Aging 1BB3 - January 23rd, 2012
4 Feb 2012
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January 23rd, 2012 y occur in the same individual over time y occur with passage of time and are due to physical decline. Cohort effect y cohort a group of people born during the same period of time often share a common background and experience of the world y related to the time of a person s birth. Period or environmental effect y effects due to the time of measurement y. Includes the social or historical effects on cohorts. Cross-sectional y studies many age groups at one point in time. Pros: y quick to do y relatively low cost y draws attention to patterns of behavior that vary by age group. Cons: y confuse changes due to aging (age effects) with changes between age groups (cohort effects) Longitudinal designs y studies a single group of people at two or more points in time. Pros: y a truer picture of change over time.
