Matched or nonmatched interventions based on the transtheoretical model to promote physical activity. A meta-analysis of randomized controlled trials.

A moderation effect of processes of change on PA behavior was suggested with borderline significance (Qb = 3.51, p = 0.06), meaning that studies using processes of change were twice as likely to increase PA ( d = 0.41, 95%CI: 0.24–0.67) compared with those that did not ( d = 0.21, 95%CI: 0.07–0.34). 3.5.7 Number of TTM theoretical constructs Eighteen studies of 33 (55%) used at least 3 of the 5 TTM constructs (e.g., SOC, decisional balance, temptation, self-efficacy, POC) to tailor their intervention.

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