Secher N J, Hansen P K, Lenstrup C, Pedersen-Bjergaard L, Eriksen P S, Thomsen B L, Keiding N
Br J Obstet Gynaecol. 1986 Feb;93(2):128-34. doi: 10.1111/j.1471-0528.1986.tb07877.x.
Birthweight-for-gestational age charts were based on the analysis of 3888 consecutive births in which the gestational age was estimated by measuring the fetal biparietal diameter before the 20th week of gestation. The data showed, in contrast to previous studies, a linear relation between gestational age and birthweight without inflection after term. The regression parameters showed a strongly significant difference between girls and boys. Thus, boys were 1.5% heavier than girls at 190 days gestation and 3.6% heavier at 300 days gestation. The linearity in the birthweight-for-gestational age charts could be due to the more reliable gestational age based on early ultrasound.
胎龄别出生体重图表基于对3888例连续分娩的分析得出，其中胎龄是通过在妊娠20周前测量胎儿双顶径来估计的。与之前的研究相反，数据显示胎龄与出生体重之间存在线性关系，足月后无拐点。回归参数显示男孩和女孩之间存在显著差异。因此，妊娠190天时男孩比女孩重1.5%，妊娠300天时重3.6%。胎龄别出生体重图表中的线性关系可能归因于基于早期超声的更可靠的胎龄。
