AN UPDATE OF THE SWEDISH REFERENCE-STANDARDS FOR WEIGHT, LENGTH AND HEAD CIRCUMFERENCE AT BIRTH FOR GIVEN GESTATIONAL-AGE (1977-1981)
AN UPDATE OF THE SWEDISH REFERENCE-STANDARDS FOR WEIGHT, LENGTH AND HEAD CIRCUMFERENCE AT BIRTH FOR GIVEN GESTATIONAL-AGE (1977-1981)
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DOI：
10.1111/j.1651-2227.1991.tb11945.x
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发表时间：
1991-08-01
期刊：
影响因子：
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通讯作者：
KARLBERG, P
中科院分区：
文献类型：
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作者：
NIKLASSON, A;ERICSON, A;KARLBERG, P
更新了瑞典出生时体重、身长和头围参考标准的每周孕龄。它基于 1977 年至 1981 年出生的瑞典婴儿队列总数 (n = 475588)。使用前瞻性收集的数据提取“健康人群”（79%）。每周（28-42 周）的身长和头围分组数据非常接近正态分布，但出生体重的分布呈正偏态。使用平方根对出生体重的原始偏态分布进行转换，得到接近高斯的分布。出于平滑目的，均值和标准差的弱值均由三次多项式函数拟合。这些函数还可以计算单个新生儿的连续变量、标准差分数以及比较婴儿组之间的分布。这里提供的参考值和图表比目前的瑞典参考值和图表有两个主要优点：在较低胎龄下使用的样本量现在足够大，因此可以使用经验发现的变化，并且已经考虑了出生体重分布的偏度。使用此处提供的参考标准可以改善并促进出生时尺寸偏差的评估。
An update of the Swedish reference standards for weight, length, and head circumference at birth, for each week of gestational age, is presented. It is based on the total Swedish cohorts of infants born 1977-1981 (n = 475588). A "healthy population" (79%) was extracted, using prospectively collected data. Weekly (28-42 weeks) grouped data for length and head circumference were well approximated by the normal distribution, but the distributions for birthweight were positively skewed. The original skewed distributions for birthweight were transformed, using the square root, resulting in distributions close to the Gaussian. For smoothing purposes, the weakly values for the mean and the standard deviation were both fitted by a third degree polynomial function. These functions also make possible the calculation of the continuous variable, standard deviation score, for individual newborn infants as well as a comparison of distributions between groups of infants. The reference values and charts presented here have two major advantages over the current Swedish ones: the sample size used is now sufficiently large at the lower gestational ages, so that empirically found variations can be used, and the skewness of the birth weight distribution has been taken into account. The use of the reference standards presented here improves and facilitates evaluation of size deviation at birth.