Table 4. Effect sizes (Hedges' g) and 95% confidence intervals for differences between the intervention and control conditions at each measurement occasion.

	Measurement occasion
	Post intervention		6 month follow up
	g	95% CI	g	95% CI
Web only vs control	0.76	0.21–1.31	1.19	0.55–1.83
Web with tracking vs control	1.04	0.40–1.67	1.26	0.57–1.94
Web only vs Tracking only	0.38	0.14–0.89	0.58	0.01–1.15
Web with tracking vs control	0.65	0.06–1.24	0.60	0.02–1.20