Table 1.

Samples characteristics according to presence or absence of IUGR

Sample characteristics	Normal (n = 9)	IUGR (n = 21)	p
Maternal age at birth (years)	33.78 (4.24)	31.30 (5.75)	0.258a
Maternal smoking (%)	11%	15%	0.779b
Gestational age (weeks)	38.54 (1.26)	37.12 (1.10)	0.005a
Birth weight (g)	3091 (323)	1997 (416)	< 0.001a
Fetal sex	Female: 67% Male: 33%	Female: 65% Male: 35%	0.445b

Data are expressed as mean (SD) and percentage

IUGR intrauterine grown restriction

^at test, ^bX² test