Table 1 Distribution of main characteristics of deliveries of infants enrolled in the two pilot studies
From: Rationales, design and recruitment for the Elfe longitudinal study
First pilot study (338 live deliveries) | Second pilot study (552 live deliveries) | |||
|---|---|---|---|---|
n | % | n | % | |
Participation rate at maternity | 191 | 57 | 300 | 54 |
Biological samples collected* | - | - | 248 | 82 |
Parity | ||||
0 | 58 | 36 | 113 | 37 |
1 | 63 | 39 | 111 | 36 |
2 | 41 | 25 | 82 | 27 |
Maternal age | ||||
<20 | 2 | 1 | 4 | 1 |
20-24 | 30 | 17 | 34 | 11 |
25-29 | 65 | 36 | 89 | 30 |
30-34 | 55 | 30 | 118 | 40 |
35+ | 29 | 16 | 53 | 18 |
Preterm birth | 15 | 8 | 24 | 8 |
Caesarean delivery | ||||
Yes | 35 | 19 | 53 | 18 |
No | 147 | 81 | 247 | 82 |
Birth weight (g) Mean (SD) | 3346 (471) | 3335 (496) | ||