TABLE 1

Summary of demographic data on term and preterm placentas

	Term	Preterm
Mean age of pregnancy	27.4 ± 5.4	26.6 ± 5.6
Mean of gestational weeks	39.2 ± 1.4	32.2 ± 3.2
Cesarean sections	57%	76%
Weight at birth (g)	3743 ± 491	1761 ± 732
Number	14	17