Fig. 3: Weight-for-age z-scores among late preterm-born infants fed with breast milk (n=24) or preterm formula (N=17), from birth −to 10 weeks of age.

Data are presented as boxplots (median, first quartile at the lower boundary, third quartile at upper boundary, and whiskers representing the minimum and maximum values within a distance of 1.5 inter-quartile range value. Values outside this range are reported separately). Z-scores were calculated using the z-score calculator developed by Fenton TR.¹¹ The groups did not show statistically significant differences.