Please answer the following pertaining to case-control studies. 1.Case-Control S
ID: 3500409 • Letter: P
Question
Please answer the following pertaining to case-control studies.
1.Case-Control Study with Friend Controls
b…What is a bias that this study design is less likely to have?
c…What kind of bias this study design mostprone to?
d…What kind of bias this study design prone to?
2.Case-Control Study with Relative Controls
b…What is a bias that this study design is less likely to have?
c…What kind of bias this study design mostprone to?
d…What kind of bias this study design prone to?
3.Case-Control Study with Population Controls
a…What is a bias that this study design avoids?
b…What is a bias that this study design is less likely to have?
c…What kind of bias this study design mostprone to?
d…What kind of bias this study design prone to?
Explanation / Answer
3.A population-based case-control study is one in which the cases come from a precisely defined population, such as a fixed geographic area, and the controls are sampled directly from the same population. In this situation cases might be identified from a state cancer registry, for example, and the comparison group would logically be selected at random from the same source population. Population controls can be identified from voter registration lists, tax rolls, drivers license lists, and telephone directories or by "random digit dialing". Population controls may also be more difficult to obtain, however, because of lack of interest in participating, and there may be recall bias text annotation indicator, since population controls are generally healthy and may remember past exposures less accurately. The aim of a case-control study is to select study controls who are representative of the population which produced the cases. Controls are used to provide an estimate of the exposure rate in the population. Therefore, selection bias may occur when those individuals selected as controls are unrepresentative of the population that produced the cases. Due to time limit,remaining questions can be asked as another question,they will be answered,thankyou for your cooperation