Fig 2. Trends in age-related changes for mean tibial bone SOS in terms of postnatal age (PNA) and preterm infants of PNA and corrected age (CA) during infancy.

Tibial bone SOS in each age class of PNA in term infants and CA in preterm infants was compared using t tests. The corresponding p value (PNA in term infants versus CA in preterm infants) is shown for each age class. Post-hoc Bonferroni adjustment was applied to p values to account for multiple comparisons; hence, p values < 0.006 (≈ 0.05/8) were considered statistically significant (*) between term infants in PNA and preterm infants in CA.