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