Table 9.

Meta-regression investigating the variables influencing the odds ratio for positive BoP between smokers and e-cigarette users

	Model 1		Model 2		Model 3		Model 4		Model 5		Model 6
Moderator	$\beta$	p	$\beta$	p	$\beta$	p	$\beta$	p	$\beta$	p	$\beta$	p
Axis section	−0.37	0.89	−1.91	0.34	−0.761	0.33	−0.96	0.17	−1.30	0.43	−1.62	≤ 0.001
Age of cigarette smokers	−0.02	0.79
Age of e-cigarette smokers			0.02	0.68
Duration of cigarette consumption					−0.03	0.64
Duration of e-cigarette consumption							−0.04	0.83
Daily cigarette consumption									0.01	0.96
Daily e-cigarette consumption											−0.04	0.09
QHeterogeneity	13.36	0.02	13.29	0.02	13.01	0.02	13.5	0.02	11.56	0.02	10.9	0.05
Qmoderator	0.07	0.79	0.16	0.68	0.22	0.64	0.05	0.83	0.00	0.96	2.84	0.09
I2	0.64		0.63		0.63		0.64		0.66		0.53
${\tau }^2$	0.39		0.38		0.37		0.39		0.44		0.00
R2	−		−		−		−		−		−