In a coho study, to study association between factor and disease, the risk ratio was calculated to be equal to 1. What does this signifies?

Ans: A. There is no association present between the factor and the diseaseEstimation of relative risk (RR):Direct measure (or index) of strength of association between suspected cause and effect.RR=1 - Indicates no association.RR > 1 - Indicates positive association between exposure & disease under study.RR = 2 - Indicates incidence rate of disease is 2 times higher in exposed group (compared with unexposed).Impoant in etiological enquiries.