Lec12CrossSectionalStudies(Revised07)

Lec12CrossSectionalStudies(Revised07) - Identify...

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Cross-Sectional Studies
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Features of C-S Studies Snapshot in time e.g. - cholesterol measurement and ECG measured at same time Determines prevalence at a point in time Therefore, C-S is a prevalence study
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Design of a C-S Study
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Design of a C-S study (Cont.)
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Fig 9-11 p. 155
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Advantages of C-S Studies Short term Fewer resources required Less statistical analysis More easily controlled Design less complex
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Advantages of C-S Studies (Cont.) Provide relationship between attributes of disease and characteristics of various groups, e.g. elderly group Data is useful for planning of health services and medical programs
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Disadvantages of C-S Studies Represent only those who are surveyed
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Unformatted text preview: Identify prevalence, not incidence necessarily excludes cases that died before study was done Show association with survival - not risk of development People who are ill may not show up for survey -*Healthy Person Effect Often, not possible to establish temporal relationshipship between exposure and onset e.g. does high cholesterol precede CHD? Not too effective if disease levels are low Disadvantages of C-S Studies (cont.) Therefore, difficult to establish a causal relationship Data can be only suggestive of causation Disadvantages of C-S Studies (cont.)...
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Lec12CrossSectionalStudies(Revised07) - Identify...

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