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Table 1 Study variables

From: Physical activity intervention (Movi-Kids) on improving academic achievement and adiposity in preschoolers with or without attention deficit hyperactivity disorder: study protocol for a randomized controlled trial

Type of variable Specific variables
Primary endpoint measures Anthropometry: weight, height, body mass index, waist circumference, triceps skinfold thickness, percentage of body fat and fat-free mass by bioelectrical impedance analysis
Academic achievement
Secondary endpoint measures Attention deficit hyperactivity disorder risk: parents’ and teachers’ report using the Attention Deficit Hyperactivity Disorder Rating Scale-IV
Motor skills: fine motor skills, throws and catches, and balance (static and dynamic), assessed by the Movement Assessment Battery for Children
Health-related quality of life: children’s (by interview) and parents’ (self-administered) report, using the Kiddy-Kindl Questionnaire
Sleep quality: parents’ report using the Children’s Sleep Habits Questionnaire, accelerometers, children’s sleep diary
Other endpoint measures Physical activity: parents’ report by the Netherlands Physical Activity Questionnaire, accelerometers
Potential confounding factors Age
Breastfeeding: breastfeeding, formula feeding or both (mixed feeding)
Food consumption: parents’ report, using the Children’s Eating Habits Questionnaire
Family socio-economic status: education, occupation and socio-economic status index
Area (urban or rural)
Origin (native or foreign)