Using the internet to promote health behavior change: a systematic review and meta-analysis of the impact of theoretical basis, use of behavior change techniques, and mode of delivery on efficacy.

Intervention Characteristics Across all interventions, the homogeneity Q statistic was highly significant (Q = 896.67, P < .001), which indicates considerable variability across effect sizes from the primary studies.

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Interventions that targeted smoking abstinence tended to have slightly smaller effects on behavior that did not reach statistical significance (d + = 0.07, k = 12, 95% CI -0.04 to 0.18).

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