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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)
  1. * only tested for the second pilot study