Table 1.

Causal mediation effects of the H4L intervention on the Big 6 lifestyle risk behaviours

	Total effect						Pure natural direct effect						Total natural indirect effect
	RD	95% CI		RR	95% CI		RD	95% CI		RR	95% CI		RD	95% CI		RR	95% CI
Alcohol use	1.2%	−0.4%	2.9%	1.08	0.97	1.20	2.4%	0.6%	4.4%	1.15	1.04	1.30	−1.1%	−2.1%	−0.6%	0.94	0.89	0.97
MVPA	−3.0%	−4.9%	−1.1%	0.96	0.94	0.99	−3.4%	−6.3%	−1.5%	0.96	0.92	0.98	0.5%	−0.1%	2.7%	1.01	1.00	1.04
Screen time	−1.1%	−2.3%	0.1%	0.99	0.98	1.00	−0.7%	−2.6%	1.3%	0.99	0.97	1.01	−0.4%	−2.1%	1.2%	1.00	0.98	1.01
Sleep risk	−2.0%	−4.2%	0.2%	0.95	0.89	1.01	0.1%	−3.6%	5.3%	1.00	0.91	1.14	−2.1%	−6.8%	−0.3%	0.95	0.85	0.99
SSB intake	1.8%	−0.3%	3.8%	1.07	0.99	1.15	2.3%	−1.3%	8.0%	1.09	0.95	1.31	−0.5%	−5.9%	2.3%	0.98	0.83	1.10
Tobacco use	1.1%	0.0%	2.2%	1.19	1.00	1.43	1.8%	0.7%	3.8%	1.31	1.11	1.68	−0.7%	−2.2%	−0.2%	0.91	0.76	0.97

MVPA moderate-vigorous physical activity, SSB sugar-sweetened beverages, RD risk difference, RR risk ratio, 95% CI 95% confidence intervals. Multiple mediators include knowledge, intentions, self-efficacy, and self-control. Models include age, sex, psychological distress, location, mediators at baseline, and outcomes measured at baseline as covariates