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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