Table II.

Demographic data for all eligible infants, preterm infants, and term infants

Characteristic	All infants (n = 318)	Preterm (n = 148)	Term (n = 170)
Male sex, n (%)	191 (60)	87 (59)	104 (61)
White, n (%)	118 (37)	51 (34)	67 (39)
Non-Hispanic, n (%)	263 (83)	128 (86)	135 (79)
Birth weight, g, median (IQR)	2735 (1650–3326)	1580 (1005–2279)	3233 (2917–3635)
Gestational age, weeks, median (IQR)	37 (32–39)	31 (28–35)	39 (38–40)
Postnatal age, days, median (IQR)	3 (1–20)	12 (2–29)	2 (1–6)
Antibiotics at time of LP, n (%)	229 (72)	114 (77)	115 (68)
Days on antibiotics before LP, median (IQR)	1 (0–4)	2 (1–10)	1 (0–2)
Central line present, n (%)	89 (28)	66 (45)	23 (14)