Table 1

 Characteristics of study population (n  =  63)

Values are mean (SD) (range).
Gestational age (weeks)30.5 (2.5) (26–37)
Study age (weeks)34.5 (1.5) (31–38)
Birth weight (g)1264 (232) (795–1600)
Study weight (g)1852 (156) (1349–2235)