You are conducting a casecontrol study where you complete te

You are conducting a case-control study where you complete telephone interviews of both cases and controls. Your cases are people with listeriosis; the controls are healthy individuals from the general population identified through random digit dialing, matched to cases by age and gender. You end up with an 81% response rate. What is the most likely form of bias in this study?

a. Control selection bias

b. Self-selection bias

c. Recall bias

d. None - perfect study design

Solution

b. Self-selection bias because not all selected people responded to the survey.