Table 4.

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

Environment (E)	Susceptibility (S)	Case	Control	Odds Ratio (OR)
–	–	a	b = pB	1.0 (ref)
–	+	c	d = pD	ORs=$\frac{\mathrm{cb}}{\mathrm{ad}}$=$\frac{\mathrm{cB}}{\mathrm{aD}}$
+	–	e	f = pF	ORe=$\frac{\mathrm{eb}}{\mathrm{af}}$=$\frac{\mathrm{eB}}{\mathrm{aF}}$
+	+	g	h = pH	ORse=$\frac{\mathrm{gb}}{\mathrm{ah}}$=$\frac{\mathrm{gB}}{\mathrm{aH}}$