Table 1
Patient characteristics at recruitment
Gestation at birth (weeks)
23
24
25
26
27
28
29
30
31
Total
Sex
Female
7
11
20
13
17
34
12
14
33
161
Male
6
25
23
26
34
32
25
29
35
235
Total
13
36
43
39
51
66
37
43
68
396