Table 2 An example of a study with cases and non-cases

–

–

a

B

a + B

1.0 (ref)

1.0 (reference)

–

+

c

D

c + D

RR_s=\(\frac{\mathrm{c}\left(\mathrm{a}+\mathrm{B}\right)}{\mathrm{a}\left(\mathrm{c}+\mathrm{D}\right)}\)

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

+

–

e

F

e + F

RR_e=\(\frac{\mathrm{e}\left(\mathrm{a}+\mathrm{B}\right)}{\mathrm{a}\left(\mathrm{e}+\mathrm{F}\right)}\)

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

+

+

g

H

g + H

RR_se=\(\frac{\mathrm{g}\left(\mathrm{a}+\mathrm{B}\right)}{\mathrm{a}\left(\mathrm{g}+\mathrm{H}\right)}\)

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