TABLE 1

Neonatal History and Characteristics at the Time of Study of Preterm and Term Infants

Clinical FeaturePreterm Infants (n = 35)Term Infants (n = 17)
GA, wk31.2 (0.4)***40.1 (0.3)
Birth weight, g1697 (92)***3666 (105)
Boy/girl (% boy)21/14 (60%)9/8 (53%)
Apgar scores
 1st min6 (2–9)***9 (7–9)
 5th min9 (5–9)**9 (9–10)
Received respiratory stimulant during hospitalization, n (%)20 (57%)a0
Antenatal steroids, n (%)25 (71%)0
Anemia of prematurity, n (%)14 (40%)0
2–4 weeks
 Age, wkb3.2 (0.1)3.4 (0.1)
 Weight, g3742 (103)3956 (148)
 Length, cm51.9 (0.5)53.3 (0.6)
2–3 months
 Age, wkb10.6 (0.2)10.6 (0.2)
 Weight, g5323.9 (165)5214 (179)
 Length, cm56.9 (0.7)57.8 (0.4)
5–6 months
 Age, wkb22.7 (0.3)22.3 (0.3)
 Weight, g7179 (209)6964 (200)
 Length, cm63.7 (0.5)64.3 (0.5)
  • Values are presented as mean (SEM) with the exception of Apgar scores, which are presented as median (range). ***P < .001 term versus preterm. **P < .01 term versus preterm.

  • a Nineteen preterm infants received caffeine before discharge, and 1 infant received theophylline and aminophylline; no infants were receiving respiratory stimulant medication at the time of study.

  • b CA for preterm infants; postnatal age for term infants.