Question

The authors of a cross-sectional study hypothesized that lack of regular exercise is associated with obesity in children. Their study of 12 children in Michigan, however, failed to show a statistically significant association between exercise habits and obesity (OR = 1.9, p = 0.11). Is this A) Selection Bias, B) Confounding, C) Information Bias, D) Random Error

Part B. Please Provide a rationale for the choice.

Answer 1

Answer:                 This question i have to write pointswise,because it's easy to understand you....

A. Selection Bias:

• The Bias is the term which defines that it s a systematic error in a stud which result in a study which result in wrong estimation of the alliance between the exposure and health related issues .
• Here the study on the 12 children in Michigan ,is not possible that no children in the Michigan having obesity related issues.
• So this issue is related with the selection of the sample space for the analysis.
• So Selection bias is a systematic dissimilarity between the certain features of the people are selected for the study and features of those who are not.
• This Could be due to the distortion of effect which arise when participant are selected into the study on obese characters.
• Either of the other choices are not rationale on stating the significant association between exercise and habit

B.Confounding:

• Is caused due to the exposure exist in the selected population and is associated with the exercise habit and exposure studies.
• It act as the variable between the disease and exposure in the way that in slight association arise .

C . informative Bias:

• Is not significant support the statement . The information Bias statement failed to significantly associate between exercise habit and obesity Informative Bias is defined as the method of collecting information in inappropriate and withstand systematic errors in the measurement of exercise habit and obesity .

D. Random Error:

• Is arise by the use of informative outcome measure that not classifies the case and it's control .
• Random Error is mainly caused due to the error associated with the sampling ,Measurement and Biological .
• Out of these choices only selection bias relate the issue with the case. other choices are failed to show the statistically significant association between exercise habit and obesity.

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