Harding S, Boroujerdi M, Santana P, Cruickshank Jk
MRC Social and Public Health Sciences Unit, University of Glasgow, Glasgow, UK.
Int J Epidemiol. 2006 Apr;35(2):270-6. doi: 10.1093/ije/dyi225. Epub 2005 Nov 9.
In preliminary data in Portugal, we found that African babies of migrant mothers were heavier than White Portuguese babies born in Lisbon. We investigate whether this pattern is replicated in the national data, and in addition the trends in birth weight in these groups.
Births registered between 1995 and 2002 classified by reported nationality of mothers.
849,595 Portuguese births ('Portuguese' nationality, predominantly of European descent) and 22,463 African births ('Angola', 'Cape Verde', or 'Guinea Bissau, Republic of Guinea or Equatorial Guinea' nationality, predominantly of African origin).
Among Portuguese births, there was a decline in births to teenaged mothers and an increase to mothers aged >or=35 years, with >9 years of education or in a non-manual class, but among African births there was an increase in births to teenaged mothers and a decline to mothers from advantaged socioeconomic backgrounds. Using the Wilcox-Russell method, overall mean birth weights of term Portuguese (3,303, SD 424 g) and African (3297, SD 441 g) babies were not different but the percentage of small preterm births was higher among African (4.7%) than among Portuguese (2.9%) births. Between 1995 and 2002, mean birth weight of term Portuguese babies declined by 58 g (3,334-3,276 g) and of African babies by 57 g (3,341-3,284 g). The left shift of the birth weight distributions was independent of maternal age, parity, and social factors among Portuguese babies, but among African babies the decrease appeared to be associated with socioeconomic advantage.
There has been a downward trend in birth weights in Portugal among both Portuguese and African term births, but average birth weights of the two groups were similar.
在葡萄牙的初步数据中，我们发现移民母亲所生的非洲裔婴儿比在里斯本出生的葡萄牙裔白人婴儿体重更重。我们调查了这种模式在全国数据中是否重复出现，此外还研究了这些群体的出生体重趋势。
对1995年至2002年间登记的出生信息按母亲申报的国籍进行分类。
849,595例葡萄牙籍出生（“葡萄牙”国籍，主要为欧洲血统）和22,463例非洲籍出生（“安哥拉”、“佛得角”或“几内亚比绍、几内亚共和国或赤道几内亚”国籍，主要为非洲血统）。
在葡萄牙籍出生中，青少年母亲的生育数量有所下降，而年龄≥35岁、受教育年限>9年或从事非体力劳动职业的母亲生育数量有所增加；但在非洲籍出生中，青少年母亲的生育数量有所增加，而来自社会经济背景优越的母亲生育数量有所下降。采用威尔科克斯 - 拉塞尔方法，足月葡萄牙裔婴儿（平均体重3303克，标准差424克）和非洲裔婴儿（平均体重3297克，标准差441克）的总体平均出生体重并无差异，但非洲籍出生中早产低体重儿的比例（4.7%）高于葡萄牙籍出生（2.9%）。1995年至2002年间，足月葡萄牙裔婴儿的平均出生体重下降了58克（从3334克降至3276克），非洲裔婴儿下降了57克（从3341克降至3284克）。葡萄牙裔婴儿出生体重分布的左移与母亲年龄、产次和社会因素无关，但在非洲裔婴儿中，体重下降似乎与社会经济优势有关。
在葡萄牙，葡萄牙裔和非洲裔足月出生婴儿的出生体重均呈下降趋势，但两组的平均出生体重相似。
