Table 2: Summary of the number of differentially expressed genes between the studied groups.

Comparison adjusted for multiple comparison ; fold change >1.5

5th DOLGenes presented a positive monotone trend (expression in extremely preterm is lower than that in very preterm; expression in very preterm is lower than that in moderately preterm)56
Genes presented a negative monotone trend 82

28th DOLGenes presented a positive monotone trend 253
Genes presented a negative monotone trend 55

5th DOL versus 28th DOL (paired -test)Genes whose expressions were significantly higher on the 28th DOL compared to those on the 5th DOL 1522150
Genes whose expressions were significantly lower on the 28th DOL compared to those on the 5th DOL 2909337

Extremely preterm infants measurement on the 28th DOL versus very preterm infants measurements on the 5th DOLGenes whose expressions were significantly higher in the group of extremely preterm infants compared to those in the group of very preterm infants 17629
Genes whose expressions were significantly lower in the group of extremely preterm infants compared to those in the group of very preterm infants 18627