True about confounding factor-
Ans. is 'b' i.e., It is itself a risk factor for the disease Confounding factor has following characteristics i) Associated with the both exposure and the disease ii) Distributed unequally in study and control groups iii) Itself is a risk factor for the disease.
It is found equally between study and control
It is itself a risk factor for the disease
Confounding can be eliminated by selecting a small group
It is associated with either the exposure or the