Table 1

 Clinical characteristics of the study population

Group 1 (n = 26)Group 2 (n = 50)
Values are mean (SD) or median (range) as appropriate.
Male:female12:1424:26
Gestational age, weeks30.2 (2.8)30.2 (2.9)
Birth weight, g1465 (615)1480 (540)
Apgar score at 1 min,5 (1–9)6 (1–10)
Apgar score at 5 min,8 (4–10)8 (5–10)
Number of punctures23 (6–126)22 (5–117)
Day of placement of reservoir15 (1–49)15 (1–86)