Niimi Shingo, Kimura Takuro, Saiki Reo, Kanda Hiroshi, Okamatsu Yuki, Goto Maki, Yatsuga Shuichi
Department of Pediatrics, Iizuka Hospital, Iizuka, JPN.
Department of Pediatrics, Tagawa Hospital, Tagawa, JPN.
Cureus. 2022 Dec 27;14(12):e32991. doi: 10.7759/cureus.32991. eCollection 2022 Dec.
Aim In developed countries including Japan, gestational age (GA) is predicted by the last menstrual period (LMP) and/or fetal ultrasound. In some developing countries, GA is predicted by infant's foot length (FL). Pregnant women who did not have pregnancy check-up is not infrequent in Japan, therefore there are sometimes opportunities to estimate the GA from infants after the delivery. The aim of this study is to determine the estimated GA formula from infant's FL in Japanese. Methods This study was a prospective cohort study. Infants between May 2021 and August 2021 at Iizuka Hospital and Tagawa Hospital or transferred from other hospitals within 24 hours of birth were collected. GA was determined using LMP and/or fetal ultrasound. The infant's FL was measured with a digital caliper within 24 hours of birth. The relationship between FL and GA was analyzed by simple regression analysis to determine the coefficient of determination (R). The infant's FL of males and females, infant's FL of preterm and term, and infant's FL of low birth weight and appropriate weight infants were performed by the -test as independent samples. A statistically significant difference was p < 0.05. Statistical analysis was performed using JMP Pro 16 (SAS Institute Japan Co., Ltd., Minato-ku, Tokyo). Results Ninety of the 135 infants were enrolled. The average GA was 38.2 ± 1.8 weeks, the average infant's FL was 7.230 ± 0.411 centimeter (cm), and the range of the infant's FL was 5.385 to 8.089 cm. The estimated GA formula, = 18.49 + 0.27 x (R = 0.39), was determined. Conclusions We determined the estimated GA formula from the infant's FL. There are some limitations and care should be taken in the use.
目的 在包括日本在内的发达国家，通过末次月经日期（LMP）和/或胎儿超声来预测孕周（GA）。在一些发展中国家，通过婴儿足长（FL）来预测GA。在日本，未进行孕期检查的孕妇并不少见，因此有时会有在分娩后根据婴儿情况估算GA的机会。本研究的目的是确定日本婴儿FL的GA估算公式。方法 本研究为前瞻性队列研究。收集了2021年5月至2021年8月在饭冢医院和多贺医院出生的婴儿，或出生后24小时内从其他医院转诊而来的婴儿。使用LMP和/或胎儿超声确定GA。在出生后24小时内用数字卡尺测量婴儿的FL。通过简单回归分析分析FL与GA之间的关系以确定决定系数（R）。对男婴和女婴的FL、早产和足月婴儿的FL以及低出生体重和正常体重婴儿的FL进行独立样本t检验。统计学显著性差异为p < 0.05。使用JMP Pro 16（SAS Institute Japan Co., Ltd., 东京都港区）进行统计分析。结果 135名婴儿中有90名被纳入研究。平均GA为38.2 ± 1.8周，平均婴儿FL为7.230 ± 0.411厘米（cm），婴儿FL范围为5.385至8.089 cm。确定了GA估算公式， = 18.49 + 0.27 x （R = 0.39）。结论 我们确定了基于婴儿FL的GA估算公式。使用时存在一些局限性，应谨慎对待。
