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Mean difference (95% confidence interval) in cognitive score at 24 months associated with an increase in summative growth z‐score by 1 for 6‐month intervals between 0 and 24 months. (a) Weight‐for‐age z‐score (WAZ). (b) Length‐for‐age z‐score (LAZ). (c) Head‐circumference‐for‐age z‐score (HCZ)
