Table 2.

Growth factor levels in blood samples from preterm infants.

Sample	Level, Mean (range)
	VEGF (pg/ml)	PF-4 (µg/ml)
Cohort I: preterm infants
rS	362.26 (155.83–555.78)	5.49 (2.77–9.92)
CB_P	10.08 (n.d. – 36.19)	1.59 (0.53–3.51)
Cohort II: infants with acute ROP
S	447.75 (152.52–1045.27)	19.54 (6.10–38.68)
CB_P	89.04 (19.50–245.91)	1.11 (0.09–3.29)

Abbreviations: S: serum; rS: serum from recalcified citrate blood; CB_P: plasma from citrate blood; n.d.: not detectable.