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Measures of strength of association (view source)
Revision as of 16:42, 4 May 2011
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The measures of disease frequency which could be extracted from this table will depend on the [[Study design|study design]] used, which will be [[Analytic studies#Study design|analytic]] in nature, as data regarding exposure has been collected.<br>
The measures of disease frequency which could be extracted from this table will depend on the [[Study design|study design]] used, which will be [[Study design#Analytic studies|analytic]] in nature, as data regarding exposure has been collected.<br>
In the case of a [[Cross sectional studies#Study design|cross sectional study]], the '''[[Prevalence#Measures of disease frequency|prevalence]]''' can be estimated amongst exposed individuals as (a<sub>1</sub>/n<sub>1</sub>), and amongst unexposed individuals as (a<sub>0</sub>/n<sub>0</sub>).<br>
In the case of a [[Cross sectional studies#Study design|cross sectional study]], the '''[[Measures of disease frequency#Prevalence|prevalence]]''' can be estimated amongst exposed individuals as (a<sub>1</sub>/n<sub>1</sub>), and amongst unexposed individuals as (a<sub>0</sub>/n<sub>0</sub>).<br>
In the case of a [[Cohort studies#Study design|cohort study]], the '''[[Incidence risk#Measures of disease frequency|incidence risk]]''' can be estimated amongst exposed individuals as (a<sub>1</sub>/n<sub>1</sub>), and amongst unexposed individuals as (a<sub>0</sub>/n<sub>0</sub>). Alternatively, the [[Incidence rate#Measures of disease frequency|incidence rate]] can be estimated as (a<sub>1</sub>/[total number of animal-time units in exposed group]) amongst exposed animals and (a<sub>1</sub>/[total number of animal-time units in unexposed group]) amongst unexposed animals.
In the case of a [[Study design#Cohort studies|cohort study]], the '''[[Measures of disease frequency#Incidence risk|incidence risk]]''' can be estimated amongst exposed individuals as (a<sub>1</sub>/n<sub>1</sub>), and amongst unexposed individuals as (a<sub>0</sub>/n<sub>0</sub>). Alternatively, the [[Measures of disease frequency#Incidence rate|incidence rate]] can be estimated as (a<sub>1</sub>/[total number of animal-time units in exposed group]) amongst exposed animals and (a<sub>1</sub>/[total number of animal-time units in unexposed group]) amongst unexposed animals.