True about confounding factor
.a "confounding factor"is defines as one which is associated both with exposure and disease and is distributed unequally in study and control groups.a cofounding factor by itself is a risk factor for the disease independently of any association. ref:park&;s textbook,ed22,pg no 63
It is found equally between study and the control groups
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 disease
Epidemiology