Table 4.

Model testing mediation of the associations between use of RYO cigarettes and quit attempts by weekly spend on smoking (see figure 1)

	Coeff.	SE	P values*	Bootstrap 95% CI	Effect ratio
Total effect (path c)	−0.02	0.006	<0.001	–	–
Direct effect (path c′)	−0.0003	0.006	0.964	–	–
Indirect effect (via mediator)	−0.02	0.003	<0.001	(−0.03 to −0.02)	1.0

Analyses are adjusted for age, sex, social grade, region, survey year and daily cigarette consumption.

*P values shown for indirect effects are derived from the Sobel test for consistency with total and direct effects; however, bootstrap 95% CIs provide a more robust indication of significant mediation (see Method for more details).

Coeff, coefficient; RYO, roll-your-own.