Characteristics of the external validation samples in the ALSPAC cohort.

aWeight change z-score from birth to 9 or 12 months in equation 2 and 3 samples respectively.bGSCE = General Certificate of Secondary Education; A-level = Advanced level.cDichotomised Yes/No variable. Numbers are for Yes.dInfant BMI >91st centile and growth from birth to 2 years of age ≥1 centile band.Values are numbers (percentages) unless stated otherwise. Equation 1 could not be validated due to insufficient numbers.