Lindsay C A, Huston L, Amini S B, Catalano P M
Department of Reproductive Biology, Case Western Reserve University, Metro Health Medical Center, Cleveland, Ohio, USA.
Obstet Gynecol. 1997 Mar;89(3):377-82. doi: 10.1016/S0029-7844(96)00517-0.
To determine the longitudinal relationship between body mass index (BMI) and percent body fat in women before and during pregnancy.
Twenty-seven healthy, nonobese women were evaluated before conception, in early gestation (12-17 weeks), and in late gestation (33-36 weeks). Height and weight were measured and BMI was calculated. Percent body fat was estimated using hydrodensitometry with correction for residual lung volume.
The correlation between BMI and percent body fat before conception was r = 0.693 (P < .005); in early gestation it was r = 0.723 (P < .005) and in late gestation r = 0.633 (P < .005). The mean pregravid BMI was 21.54 and the 95% predictive confidence interval (CI) for percent body fat was 18.2, 26.5%. For the mean BMI of 22.26 in early gestation, the predictive 95% CI for percent body fat was 20.0, 29.0%. In late gestation, the mean BMI was 26.04 with a predictive 95% CI for percent body fat 22.5, 30.8%.
In nonobese women the correlation between BMI and percent body fat remains significant during pregnancy, although the 95% CI for predicting percent body fat from the mean BMI ranges widely.
确定孕期前后女性体重指数（BMI）与体脂百分比之间的纵向关系。
对27名健康、非肥胖女性在受孕前、妊娠早期（12 - 17周）和妊娠晚期（33 - 36周）进行评估。测量身高和体重并计算BMI。使用校正残肺体积的水密度测量法估算体脂百分比。
受孕前BMI与体脂百分比之间的相关性为r = 0.693（P < 0.005）；妊娠早期为r = 0.723（P < 0.005），妊娠晚期为r = 0.633（P < 0.005）。孕前平均BMI为21.54，体脂百分比的95%预测置信区间（CI）为18.2%，26.5%。妊娠早期平均BMI为22.26时，体脂百分比的预测95%CI为20.0%，29.0%。妊娠晚期，平均BMI为26.04，体脂百分比的预测95%CI为22.5%，30.8%。
在非肥胖女性中，孕期BMI与体脂百分比之间的相关性仍然显著，尽管根据平均BMI预测体脂百分比的95%CI范围较宽。
