Chapter 1 Case

1.1 DAG

  • X: child’s BMI z-score, BMI category, and activity measures (CPM, MVPA and sedentary time), and change in these
  • Z1 (Model1):
    • X = BMI: baseline BMI (age 6 years)
    • X = activity measures: child age, gender and height, baseline activity (age 6 years)
  • Z2 (Model 2): IMD, maternal and paternal BMI, and parental high blood pressure.
  • Z3 (Model 3): child’s BMI z-score at age 9 years.

1.2 Potential Bias

  • Z4: Potential unmeasured confounders