Understanding the Fundamentals of Epidemiology an evolving text

Thought question: Professors typically comment that with each entering class (i.e., cohort), students
seem to be younger. Is this an effect of age, secular time, or cohort? (See bottom of page for the
answer.)
Bibliography
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De Vita, Carol J. The United States at mid-decade. Population Bulletin, Vol. 50, No. 4 (Washington,
D.C.: Population Reference Bureau, March 1996).
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Population Bulletin, Vol. 47, No. 3 (Washington, D.C.: Population Reference Bureau, November
1992).
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(Washington, D.C.: Population Reference Bureau, October 1991)
McMichael, Anthony J. Planetary overload. Global environmental change and the health of the
human species. NY, Cambridge, 1993.
Mosley, W. Henry and Peter Cowley. The challenge of world health. Population Bulletin, Vol. 46,
No. 4 (Washington, D.C.: Population Reference Bureau, December 1991).
Petersen, William. Population 2 nd ed. Macmillan, London,1969
Remington, Richard D. and M. Anthony Schork. Statistics with applications to the biological and
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Roudi, Farzaneh. Iran's revolutionary approach to family planning. Population Today, July/August
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Web sites: Data and publications are now widely available over the World Wide Web. A list of
useful sites (e.g., www.ameristat.org, www.cdc.gov and www.cdc.gov/nchswww, www.who.int)
is available at www.sph.unc.edu/courses/epid168/.
Answer: Age - the aging of the professors!
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www.epidemiolog.net, © Victor J. Schoenbach 1999, 2000 3. Studying populations - basic demography - 51
rev. 1/17/2000, 8/16/2000, 3/9/2001