Identifying appropriate pre-pregnancy body mass index classification to improve pregnancy outcomes in women of childbearing age in Beijing, China: a retrospective cohort study.

Background And Objectives: This study explored the appropriate classification of pre-pregnancy body mass index (BMI) in women of childbearing age in Beijing, China.

Methods And Study Design: Women with singleton pregnancies at more than 28 gestational weeks were retrospectively reviewed. Based on the pre-pregnancy BMI (kg/m2), these patients were divided into 7 groups: <18.

Building a predictive model for successful vaginal delivery in nulliparas with term cephalic singleton pregnancies using decision tree analysis.

Aim: To establish a model predicting successful vaginal delivery (VD) in nulliparas with term cephalic singleton pregnancies.

Methods: We retrospectively identified 6799 term nulliparas with cephalic singletons (6416 VD and 383 cesarean section [CS] due to dystocia) who entered labor (cervical dilation ≥2 cm) between September 2014 and August 2015. Using VD as the dependent variable and age, maternal body height, educational attainment, gravidity, gestational age, pre-pregnancy body mass index (BMI), BMI upon admission for delivery, gestational weight gain, gestational hypertension and gestational diabetes as the independent variables, predictors of VD success were identified using a multivariate binary logistic regression and then ranked with decision-tree analysis.

[Effects of boron on indole-3-acetic acid transportation in intact phaseolus aureus plant].

With intact Phaseolus aureus plant as test material, this paper studied the effects of boron deficiency on its axillary bud growth and polar auxin transportation. The results showed that boron deficiency induced axillary bud growth significantly, while applying indole-3-acetic acid (IAA) could suppress the axillary bud growth induced by the decapitation of boron sufficient plant. When the plant deficient in boron was decapitated, applying IAA could delay the axillary bud growth.