Recent trend of increase in proportion of low birthweight infants in Japan
Recent trend of increase in proportion of low birthweight infants in Japan
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DOI：
10.1093/ije/30.6.1269
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发表时间：
2001-12-01
影响因子：
7.7
通讯作者：
Mochizuki, Y
中科院分区：
文献类型：
--
作者：
Ohmi, H;Hirooka, K;Mochizuki, Y
从1950年到1970年代，日本低出生体重婴儿（LBW：1500-2499 g）的比例稳步下降。然而，从那时起，它开始持续增加，其原因尚未详细讨论。方法出生体重变化趋势和两个已知的低出生体重因素（母亲吸烟和孕前体重）与生命统计、全国营养和吸烟流行率调查数据进行分析。是20世纪70年代以来总体增长的主要风险因素。30多岁女性吸烟率的上升始于1970年代，而20多岁女性吸烟率的上升始于1960年代。30多岁女性的体重指数下降也是从70年代开始的，而20多岁女性的体重指数下降则是从60年代开始的。结论自20世纪70年代以来，吸烟率的增加和年轻女性尤其是30多岁女性体重指数的下降是导致低出生体重儿增加的主要因素。
Background The proportion of low birthweight babies (LBW: 1500-2499 g) in Japan decreased steadily from 1950 to the 1970s. However, since then it has started to increase consistently, the reason for which has not been discussed in detail.Methods Trends of birthweight and the two known factors for low birthweight (maternal smoking, and pre-pregnancy weight) were analysed with vital statistics, national nutritional and smoking prevalence survey data.Results Increase in term LBW due to intrauterine growth retardation, is the major risk factor for the overall increase Since the 1970s. The increase of smoking prevalence in women in their thirties started in the 1970s, while that for women in their twenties started in the 1960s. The decrease of body mass index for women in their thirties also began in the 1970s, while that for women in their twenties began in the 1960s. The ratio of delivery to mothers in their thirties to mothers in their twenties has increased more than threefold compared to the late 1970s.Conclusions Since the 1970s increase in smoking prevalence and decrease in body mass index in young women, especially those in their thirties, appeared to be the major factors involved in the increase in LBW babies.