Table 1 Main features of the three cohort studies
From: The economic value of human milk from three cohort studies in Friuli Venezia Giulia, Italy
Main features | Cohort 1 (1999) | Cohort 2 (2007) | Cohort 3 (2016) |
|---|---|---|---|
Sample size | 842 | 400 | 265 |
Inclusion criteria | Healthy term newborns | Healthy term newborns | All infants (no preterm < 30 weeks) |
Recruitment site | Hospital | Hospital | Paediatric practice |
Recruitment time | Soon after birth | Soon after birth | At 1–4 weeks of age |
Follow up | 12 months | 24 months | 36 months |
Assessments | At birth and every month up to 12 months of age | At birth and at 1, 3, 6, 9, 12 18 and 24 months of age | At birth and at 1, 3, 5, 8, 12, 18, 24 and 36 months of age |
No or invalid data (lower rate) | 1% at 1 month | 28% at 1 month | 5% at 1 month |
No or invalid data (higher rate) | 7% at 11 months | 67% at 24 months | 15% at 36 months |