07-Crosssectional

07-Crosssectional - 2/22/2011 Cross-sectional studies 1...

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Unformatted text preview: 2/22/2011 Cross-sectional studies 1 Study designs: Cross-sectional studies, ecologic studies (and confidence intervals) Victor J. Schoenbach, PhD home page Department of Epidemiology Gillings School of Global Public Health University of North Carolina at Chapel Hill www.unc.edu/epid600/ Principles of Epidemiology for Public Health (EPID600) 2 Signs from around the world In a Copenhagen airline ticket office: We take your bags and send them in all directions. 3 Signs from around the world In a Norwegian cocktail lounge: Ladies are requested not to have children in the bar. 4 Signs from around the world Rome laundry: Ladies, leave your clothes here and spend the afternoon having a good time. 5 Faster keyboarding - 1 I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy. It dn'seot mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it wouthit a porbelm. Gary C. Ramseyer's First Internet Gallery of Statistics Jokes http://davidmlane.com/hyperstat/humorf.html (#162) 6 Faster keyboarding - 2 Most of my friends could read this with understanding and rather quickly I might add. Then I had them read a statistical bit of literature: Miittluvraae asilyans sattes an idtenossiy ctuoonr epilsle is the itternoiecsno of a panle pleralal to the xl- yapne and the sruacfe of a btiiarave nmarol dbttiisruein. Gary C. Ramseyer's First Internet Gallery of Statistics Jokes http://davidmlane.com/hyperstat/humorf.html (#162) 2/22/2011 Cross-sectional studies 7 Study designs: Cross-sectional studies, ecologic studies (and confidence intervals) Victor J. Schoenbach, PhD home page Department of Epidemiology Gillings School of Global Public Health University of North Carolina at Chapel Hill www.unc.edu/epid600/ Principles of Epidemiology for Public Health (EPID600) 10/15/2001 Cross-sectional studies 8 Today outline Cross-sectional studies (and sampling) Ecologic studies Confidence intervals 2/10/2009 Cross-sectional studies 9 Cross-sectional studies Cross-sectional studies include surveys People are studied at a point in time, without follow-up. Can combine a cross-sectional study with follow-up to create a cohort study. Can conduct repeated cross-sectional studies to measure change in a population. 2/22/2011 Cross-sectional studies 10 Cross-sectional studies Number of uninsured Americans rises to 50.7 million . (USA Today, 9/17/2010; data from Census Bureau) In 2007-2008, almost one in five children older than 5 years was obese. ( Health, United States, 2010 ; data from the National Health and Nutrition Examination Survey) 35% (~7.4 million) of births to U.S. women during the preceding 5 years were mistimed or unwanted (2002 National Survey of Family Growth, Series 23, No. 25, Table 21) [Source: www.cdc.gov/nchs/] 2/10/2009...
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07-Crosssectional - 2/22/2011 Cross-sectional studies 1...

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