What is true about confounding factor?: (A) It is found equally between study and control groups, (B) It itself is a risk factor for the disease, (C) Confounding can be eliminated by selecting a small group, (D) It is associated with either the exposure or the disease
Answer is B. Confounding factor is defined as one which is associated with both exposure and disease and is distributed unequally in study and control groups. (refer pg no:72 park 23 rd edition)