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Table 3 Overview of outcome and mediator variables, indicators, instruments and time points of assessment

From: A Healthy School Start Plus for prevention of childhood overweight and obesity in disadvantaged areas through parental support in the school setting - study protocol for a parallel group cluster randomised trial

Variables Indicators and instruments Time point of assessmenta
Demographic data parents Sex, age, country of birth, years in Sweden, level of education, housing conditions, employment, weight, height, number of children T0
Child’s diet Child Eating Habits Questionnaire EQ [73]
Revised version of Eating and Physical Activity Questionnaire (EPAQ) [53]
Mobile phone based photo method based on Delisle et al. [54]
T0, T1, T2
Child’s physical activity and sedentary behaviour Accelerometry
Questionnaire: Active transport, activity in organisation, screen time on week days and weekends
T0, T1, T2
Child’s sleep Revised version of Eating and Physical Activity Questionnaire (EPAQ) [53]  T0, T1, T2
Child’s BMI Height and weight measured with instruments (SECA) T0, T1, T2
Child’s waist circumference Measured with instruments (SECA) T0, T1, T2
Parental self-efficacy Revised instrument based on Wright et al. [63] T0, (TM), T1, T2
Parental feeding practices Comprehensive Feeding Practices Questionnaire [64] T0, (TM), T1, T2
Parenting practices regarding children’s physical activity Items derived from item bank by Masse et al. [65] T0, (TM), T1, T2
Nurses’ self-reported MI competence Revised version of self-rating questionnaire based on MITI 4 [49] TM
Parent-report of nurse’s MI competence Revised version of self-rating questionnaire based on MITI 4 [49] TM
  1. aT0: baseline; TM: between T0 and T1; T1: 6 months after baseline; T2: follow-up 18 months after baseline