Skip to main content

Table 2 Measured variables in the Fortaleça sua Saúde program

From: Rationale and methods of a cluster-randomized controlled trial to promote active and healthy lifestyles among Brazilian students: the “Fortaleça sua Saúde” program

Dimension Variables (reliability)b
Primary Variablesa
PA √ Weekly volume in moderate to vigorous PA and PA levels (ICC = 0.71)
√ PA-related behavior change (ICC = 0.76)
√ Preference for PA in leisure-time (ICC = 0.75)
√ Active commuting (walking/cycling) to school (ICC = 0.89)
Potential PA mediators Intrapersonal: Attitudes, self-efficacy and expectations (risks/benefits) (α range = 0.77–0.81)
Interpersonal: family, friend and teacher support (α range = 0.84–0.90)
Environmental: Neighborhood and school perception (α range = 0.61–0.78)
Screen time √ Daily time watching TV on weekdays and weekends days (ICC = 0.72 and 0.56)
√ Daily time using computer/video games on weekdays and weekends days (ICC = 0.80 and 0.75)
√ Reducing TV watching-related behavior change stage (ICC = 0.80)
√ Reducing computer/videogames using-related behavior change stage (ICC = 0.78)
Potential reducing screen time mediators Intrapersonal: attitude, self-efficacy and expectations (risks/benefits) (α range = 0.64–0.85)
Interpersonal: family modelling, support and norms (α range = 0.56–0.78)
Environmental: family and school environment, house and bedroom characteristics (α range = 0.73–0.85)
Secondary variablesa √ Body mass index √ Self-rated health (ICC = 0.90)
√ Waist circumference √ Stress perception (ICC = 0.79)
√ Eating habits (ICC range = 0.71-0.89) √ Body image (ICC = 0.85)
√ Alcohol use (ICC = 0.71) √ Sleep quality and duration (ICC range = 0.59-0.75)
√ Tobacco use (ICC = 0.99) √ Sleepiness (α = 0.62)
√ Condom use (ICC = 0.98) √ Academic performance
√ Quality of life (ICC = 0.78) √ School attendance
Descriptive variablesa √ Age (ICC = 0.99) √ Mother’s schooling (ICC = 0.92)
√ Gender (Kappa = 1.00) √ Student’s occupational status (Kappa = 0.90)
√ Father’s schooling (ICC = 0.86) √ Family’s economy class (ICC = 0.93)
Subsample (obese) Variablesa √ Depressive symptoms (α = 0.90) √ Objectively-measured PA
√ Eating disorders (α = 0.80) √ Objectively-measured sedentary time
√ Sleep quality (α = 0.83)  
Evaluation variables √ Interest of the school community for the program proposal (before baseline)
√ Visibility of the program during implementation (during the program)
√ Execution process of the strategies (during the program)
√ Interest in keeping the strategies in the future (immediately after the end of the program)
√ Maintenance of the program strategies (six months after the end of the program)
√ Start-up and operational costs (economic evaluation)
  1. PA Physical activity
  2. aAll these variables will be measured at baseline and immediately after the intervention
  3. bReliability of the self-reported measures were evaluated using Kappa’s index for dichotomous variables (e.g., gender), intra-class correlation coefficient for ordinal variables (e.g., economic class) and Cronbach’s alpha for scales (e.g., attitude scales). This measures were obtained using a sample (n = 194) of students who were not enrolled in the Fortaleça sua Saúde program