Significant associations between the variables included in calculation of propensity score and breast feeding
| EPIPAGE cohort (n=2130) | LIFT cohort (n=1733) | |||
| aOR (95% CI) | p Value | aOR (95% CI) | p Value | |
| Characteristics of the mothers | ||||
| Age <25 years | 0.613 (0.42 to 0.89) | 0.010 | – | – |
| Upper socio-demographic level | 1.77 (1.34 to 2.34) | 0.001 | 2.32 (1.708 to 3.17) | 0.001 |
| Higher education | 1.557 (1.17 to 2.06) | 0.002 | – | – |
| No professional activity | 0.669 (0.44 to 1.00) | 0.052 | 0.57 (0.35 to 0.75) | 0.001 |
| Mother of foreign origin | 1.50 (1.05 to 2.14) | 0.024 | – | – |
| Characteristics of pregnancy | ||||
| Multiple pregnancy | 0.51 (0.39 to 0.67) | 0.001 | 0.69 (0.48 to 0.99) | 0.047 |
| Characteristics of the newborns | ||||
| Duration of neonatal hospitalisation (by week) | 0.89 (0.84 to 0.94) | 0.001 | 0.91 (0.85 to 0.97) | 0.004 |
| Gestational age (per week) | 1.03 (0.92 to 1.16) | 0.650 | 0.98 (0.86 to 1.10) | 0.714 |
| Birth weight (per Kg) | 1.17 (0.66 to 2.08) | 0.590 | 1.13 (0.701 to 1.83) | 0.612 |
aOR, adjusted odd ratio; LIFT, Loire Infant Follow-up Team.