Reasons for Association 3

Question 1

Bias

Answer 1

Systematic deviation of results/inferences from the truth

Question 2

Selection bias

Answer 2

Systematic error in a study that stems from the procedures used to select ps and factors that influence study participation

Question 3

Healthy worker effect

Answer 3

Potential form of selection bias specific to occupational cohort studies

Question 4

Information bias

Answer 4

Systematic error due to the information collected being wrong

Question 5

Ascertainment bias

Answer 5

Can occur in a cohort study when outcome ascertainment in the exposed group is different to the unexposed group

Question 6

Recall bias

Answer 6

Info provided differed between cases and controls

Question 7

Confounding

Answer 7

Must: be associated with exposure investigated in source population
be independently associated with the disease being investigated
not be on the causal pathway (not affected by exposure/disease)