TABLE 2.

Formulas and threshold values of ROR and PRR.

Method	Formulas	Inclusion criteria for AE
ROR	$\mathit{\text{ROR}}=\frac{\left(a/c\right)}{\left(b/d\right)}$	$95\%\mathit{\text{CI}}\succ 1$ a≥3
	$\mathit{\text{SE}}\left(\ln R0R\right)=\sqrt{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d}}$
	$95\%\mathit{\text{CI}}=e^{\ln \left(R0R\right)\pm 1.96\sqrt{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}+\frac{1}{d}}}$
PRR	$\mathit{\text{PRR}}=\frac{a/\left(a+b\right)}{\mathrm{c}/\left(\mathrm{c}+d\right)}$	$95\%\mathit{\text{CI}}\succ 1$ a≥3
	$\mathit{\text{SE}}\left(\ln PRR\right)=\sqrt{\frac{1}{a}-\frac{1}{a+b}+\frac{1}{c}-\frac{1}{c+d}}$
	$95\%\mathit{\text{CI}}=e^{\ln \left(PRR\right)\pm 1.96\sqrt{\frac{1}{a}-\frac{1}{a+b}+\frac{1}{c}-\frac{1}{c+d}}}$