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Scatter plot of infant age in days (x-axis) v. infant length-for-age Z-score (HAZ; y-axis) and regression line for combined rural-village and urban-clinic infants (n 306, r=0·101, r 2=0·010, P=0·077). Data were obtained from newborns with a median age of 19 d from eight rural villages (n 200; ×) and an urban clinic (n 106; ▵) in Quetzaltenango, western highlands of Guatemala
