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Table 1 Main measurements (self-reports)

From: A cluster randomized controlled trial comparing the effectiveness of an individual planning intervention with collaborative planning in adolescent friendship dyads to enhance physical activity (TWOgether)

Construct [References for measurement] Description Included in:
T1 T2 T3 T4 Diary
The outcome variable, additional assessment
Physical activity [42, 65] Duration in minutes (together with the friend), intensity X X X X X
Mediator and control variables
Risk perception [53, 64, 66, 67] Perceived vulnerability for one’s own health X   X X X
Outcome expectancies [53, 64, 66, 67] Expected positive and negative consequences of both acting and not acting X   X X X
Self-efficacy (individual and collaborative) [53, 64, 66, 67] Feeling of competency regarding a person’s ability to overcome barriers regarding PA X   X X X
Intention (Individual and collaborative) [53, 64, 66] Intended action of PA X   X X X
Action and coping planning (individual and collaborative) [53, 64, 66] Action planning pertains to the when, where, and how of intended action; coping planning is the anticipation of barriers and the design of alternative actions X   X X X
Action control [53, 64] Action control includes three subfacets: awareness of intentions, self-monitoring and regulatory effort X   X X X
Received social support from the friend [53, 64, 67] Emotional and practical received social support regarding PA   X X X X
Provided social support by the friend [53, 64, 67] Emotional and practical provided social support regarding PA   X X X X
Mobilization of peer social support [53, 64, 67] Activation of social support from the friend   X X X X
Characteristics of received peer social support [53, 64, 67] Perceived quality, responsiveness, and satisfaction with social support   X X X X
Received peer social control [68] Received social control from the friend regarding PA   X X X X