OR (and 95% CI)* for LBW for migrant women compared with European-born and US-born women, and for various world regions according to their place of destination (Europe vs USA)
| Migrant group | Infants born in Europe | Infants born in USA | Infants born take over in Europe take over versus in USA† |
| OR (95% CI) | OR (95% CI) | OR (95% CI) | |
| Native-born women | 1.00 | 1.00 | 0.61 (0.47 to 0.79) |
| Migrants from | |||
| Western Europe and north America | 0.91 (0.77 to 1.07) | – | – |
| East Europe | 0.99 (0.79 to 1.25) | – | – |
| North Africa and Middle East | 0.78 (0.60 to 1.01) | – | – |
| Sub-Saharan Africa | 1.75 (1.44 to 2.12) | 0.75 (0.55 to 1.02) | 1.42 (0.95 to 2.14) |
| South-central Asia | 1.84 (1.54 to 2.20) | 1.33 (1.01 to 1.77) | 0.84 (0.57 to 1.23) |
| East and south-east Asia | 1.20 (0.72 to 2.02) | 0.89 (0.73 to 1.09) | 0.82 (0.46 to 1.46) |
| Latin America and Caribbean | 1.46 (1.17 to 1.83) | 0.72 (0.62 to 0.82) | 1.24 (0.90 to 1.72) |
LBW, low birth weight; OR, odds ratio.
↵* Obtained with a three-level model including random effects (subgroup and studies) and fixed effects (migrant status, maternal region of origin, place of destination, maternal region of origin × place of destination and infant's year of birth).
↵† Infants born in the USA are the reference group.