OBJECTIVE: To identify longitudinal variables related to children's body mass index (BMI) (kg/m 2) at age 8 y. DESIGN: A longitudinal design, with nine interviews per child from ages 2 to 8 y.
This is a preview. Log in through your library . Abstract The choice among a longitudinal, mixed longitudinal, or cross-sectional design is often called for in educational and psychological research.
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