Table 4 A case-control study data generated from a population with cases and non-cases

–

–

a

b = pB

1.0 (ref)

–

+

c

d = pD

OR_s=\(\frac{\mathrm{cb}}{\mathrm{ad}}\)=\(\frac{\mathrm{cB}}{\mathrm{aD}}\)

+

–

e

f = pF

OR_e=\(\frac{\mathrm{eb}}{\mathrm{af}}\)=\(\frac{\mathrm{eB}}{\mathrm{aF}}\)

+

+

g

h = pH

OR_se=\(\frac{\mathrm{gb}}{\mathrm{ah}}\)=\(\frac{\mathrm{gB}}{\mathrm{aH}}\)