Rossavik I K, Deter R L
J Clin Ultrasound. 1984 Nov-Dec;12(9):535-45. doi: 10.1002/jcu.1870120903.
Growth of the fetal head and abdomen have been monitored by measurement of the head cube (A), the abdominal cube (B) and A/B, from 12 to 41 weeks menstrual age. Growth curves for these parameters have been determined using a specially developed growth curve model [P = c(t)k+s(t)]. R2 values of 98.0%, 96.6%, and 56.2% were obtained for A, B, and A/B, respectively. Similar results were obtained when this model was used with HC and AC data from a previous study. Variability analysis indicated a progressive increase in variability with menstrual age for both A and B while the variability of A/B decreased. The variability in the 12- to 17-week interval was significantly greater for all three parameters and the A deviation distribution was asymmetric (shifted toward negative values) after 36 weeks. Variability data were used with the growth curve models to determine standard curves for A, B and A/B.
从月经龄12周到41周，通过测量头围立方（A）、腹围立方（B）以及A/B来监测胎儿头部和腹部的生长情况。这些参数的生长曲线已使用专门开发的生长曲线模型[P = c(t)k + s(t)]确定。A、B和A/B的R2值分别为98.0%、96.6%和56.2%。当将该模型用于先前研究的头围（HC）和腹围（AC）数据时，也得到了类似结果。变异分析表明，A和B的变异均随月经龄逐渐增加，而A/B的变异则降低。在12至17周期间，所有三个参数的变异均显著更大，且36周后A的偏差分布不对称（向负值偏移）。变异数据与生长曲线模型一起用于确定A、B和A/B的标准曲线。
