FINDINGS: The merged data sets resulted in a smooth transition at 5 years for height-for-age, weight-for-age and BMI-for-age. For BMI-for-age across all centiles the magnitude of the difference between the two curves at age 5 years is mostly 0.0 kg/m2 to 0.1 kg/m2. At 19 years, the new BMI values at +1 standard deviation (SD) are 25.4 kg/m2 for boys and 25.0 kg/m2 for girls. These values are equivalent to the overweight cut-off for adults (> 25.0 kg/m2). Similarly, the +2 SD value (29.7 kg/m2 for both sexes) compares closely with the cut-off for obesity (> 30.0 kg/m2).