case control study

Which of the following statements do

not hold true for case control study?

• Both exposure and outcome have occurred before the start of the study

• The study proceeds backwards from effect to cause

• It uses control group to support or refute an inference

• The data is analysed in terms of

  incidence rates

The process by which controls are selected to ensure comparability between cases and controls is

• Confounding

• Bias

• Matching

• Blinding

Eligibility criteria in selection of case

requires:

• All current cases can be included

• Only newly diagnosed cases to be included

• All cases and controls to be included

• Only old cases to be included

Cases of case control study is drawn from

• Hospitals

• Industries

• Schools

• Old age homes

Hospital sources as controls in case control study is often a source of

• Memory bias

• Rwcall bias

• Selection bias

• Interviewer bias