Abstract
Introduction
Maternal height has been shown to be associated with adverse outcomes in women with gestational diabetes mellitus (GDM). The aim of this study is to evaluate the association between maternal height and adverse outcomes stratified for gestational weight gain (GWG) and pre-pregnancy body mass index (BMI) in women with GDM.
Methods
We conducted a retrospective study that included 2048 women diagnosed with GDM during 24–28 gestational weeks from July 1, 2017, to June 30, 2018, in Zhejiang Province, China. Demographic data, maternal characteristics and pregnancy complications were extracted from medical records. Maternal height was divided into three categories by tertiles. Chi-square was used to evaluate categorical data while one-way ANOVA was utilized to analyze continuous variables. The relationship between maternal height and adverse outcomes was examined using logistic regression.
Results
We found that shorter women had higher rates of low birth weight (LBW) (p = 0.003) and primary cesarean section (primary CS) (p < 0.001) while taller women had higher rates of abnormal neonatal ponderal index (p < 0.001), postpartum hemorrhage (p = 0.044) and macrosomia (p < 0.001). In taller women who had excess GWG, maternal height was positively associated with the risk of macrosomia (aOR 1.97, 95% CI 0.95–4.10). In shorter women who had inadequate GWG, maternal height was significantly associated with LBW (aOR 2.20, 95% CI 1.13–4.29) and primary CS (aOR 2.08, 95% CI 1.38–3.12). Maternal height was a protective factor of postpartum hemorrhage (aOR 0.15, 95% CI 0.03–0.72) in shorter women with excess GWG. In women with normal pre-pregnancy BMI, maternal height was positively associated with LBW (aOR 2.00, 95% CI 1.15–3.49) and primary CS (aOR 1.71, 95% CI 1.28–2.28) in shorter women while it was negatively associated with the risk of abnormal neonatal ponderal index in both shorter and taller women compared to average height women (aOR 0.71, 95% CI 0.55–0.92; aOR 0.66, 95% CI 0.51–0.85).
Conclusion
The association between maternal height and adverse pregnancy outcomes varies with pre-pregnancy BMI and GWG in GDM women. Taking maternal height, pre-pregnancy BMI and GWG into account and using personalized prenatal management may reduce the risk of adverse pregnancy outcomes in GDM.
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Why carry out this study? |
It has been reported that maternal height is significantly associated with increased risk of GDM and GDM-related adverse outcomes. We aim to evaluate association between maternal height and adverse outcomes stratified for gestational weight gain (GWG) and pre-pregnancy body mass index (BMI) in women with GDM. |
What was learned from the study? |
The association between maternal height and adverse pregnancy outcomes including low birth weight (LBW), primary CS, macrosomia, abnormal neonatal ponderal index and postpartum hemorrhage varies with prepregnancy BMI and GWG in GDM women. Our results provide evidence for prenatal management in consideration of maternal height by pre-pregnancy BMI and GWG to prevent adverse pregnancy outcomes in GDM women. |
Introduction
Gestational diabetes mellitus (GDM) is glucose intolerance that occurs for the first time during pregnancy [1]. Globally, the prevalence of GDM is rising, and its deleterious consequences, including pregnancy-induced hypertension, macrosomia, preterm birth, and maternal and fetal metabolic disorders, have a serious negative impact on public health [2]. The mode of delivery and adverse pregnancy outcomes have long been related to height, weight, and other anthropometric parameters. Preterm birth, hypertension, fetal growth restriction, and cesarean delivery have all been independently associated with short height [2,3,4].
Height, weight and other anthropometric measurements have long been related to mode of delivery and pregnancy complications. Short stature was found to be an independent risk factor for cesarean delivery, preterm birth, preeclampsia and fetal growth restriction [5,6,15]. LGA was defined as neonate birth weight > 90th percentile based on national population references for age and sex. PIH was diagnosed in women with no previous history of hypertension with systolic blood pressure (SBP) ≥ 140 mmHg and diastolic blood pressure (DBP) ≥ 90 mmHg on two occasions at least 4 h apart after 20 gestational weeks with or without proteinuria [16]. Primary cesarean section (CS) was defined as cesarean section performed on women with no previous history of cesarean delivery. Postpartum hemorrhage was defined as blood loss ≥ 500 ml after vaginal delivery or ≥ 1000 ml after cesarean section [17]. The ponderal index was determined by the ratio of birth weight to birth length (birth weight [kg] /length [m3]), and abnormal neonatal ponderal index was defined as < 10th percentile or > 90th percentile [18].
Statistical Analysis
Maternal and neonatal demographic and clinical features were reported as frequency (%) or mean (SD). Continuous variables were analyzed using one-way ANOVA while categorical variables (maternal age groups, parity, gravidity, pre-pregnancy BMI groups, GWG groups, adverse pregnancy outcomes) were analyzed using chi-square test. Maternal height was divided into three different categories by tertiles: shorter: ≤ 158.0 cm, average: (158.1–162.0 cm) and taller: > 162.0 cm [19]. The relationship between maternal height and adverse outcomes in different pre-pregnancy BMI groups and GWG groups was analyzed using logistic regression. Two-sided p values < 0.05 were considered significant. Statistical analyses were done with SPSS 26.0.
Results
General Characteristics and Incidence of Adverse Outcomes Among Maternal Height Categories
There were differences in GWG (p = 0.006), pre-pregnancy weight (p = 0.001), birthweight (p = 0.001), birth length (p < 0.001) and neonatal ponderal index (p < 0.001) among maternal height categories. We also noted no difference in pre-pregnancy BMI, maternal age, parity, HbA1c, fasting plasma glucose, 1 h-PG or 2 h-PG among maternal height categories. We found differences in the incidence of abnormal neonatal ponderal index, macrosomia, postpartum hemorrhage, primary CS and LBW among height categories. Women with shorter stature had higher rates of LBW (p = 0.003) and primary CS (p < 0.001). Taller women had higher rates of abnormal neonatal ponderal index (p < 0.001), postpartum hemorrhage (p = 0.044) and macrosomia (p < 0.001). The incidence of preterm birth did not significantly differ among maternal height categories (p = 0.136) (Table 1).
Association Between Maternal Height and Adverse Outcomes Stratified for GWG
Maternal height was positively associated with the risk of macrosomia in taller women who gained excess GWG compared to average height women who gained excess GWG (aOR 1.97, 95% CI 0.95–4.10). Maternal height was negatively associated with postpartum hemorrhage in shorter women who gained excess GWG compared to average height women who had excess GWG (aOR 0.15, 95% CI 0.03–0.72). Maternal height was associated with an increased risk of LBW (aOR 2.20, 95% CI 1.13–4.29) and primary CS (aOR 2.08, 95% CI 1.38–3.12) among shorter women who gained inadequate gestational weight compared to average height women with inadequate GWG. In women who gained adequate GWG, maternal height was negatively associated with the risk of abnormal neonatal ponderal index in both shorter and taller women compared to average height women (aOR 0.68, 95% CI 0.49–0.96; aOR 0.51, 95% CI 0.37–0.71) (Table 2).
Association Between Maternal Height and Adverse Outcomes Stratified for Pre-pregnancy BMI
In women with normal pre-pregnancy BMI, maternal height was positively associated with LBW (aOR 2.00, 95% CI 1.15–3.49) and primary CS (aOR 1.71, 95% CI 1.28–2.28) in shorter women while it was negatively associated with the risk of abnormal neonatal ponderal index in both shorter and taller women compared to average height women (aOR 0.71, 95% CI 0.55–0.92; aOR 0.66, 95% CI 0.51–0.85). However, there was no significant association between maternal height and macrosomia and postpartum hemorrhage when stratified for pre-pregnancy BMI (Table 3).
Discussion
This study found that the association between maternal height and adverse pregnancy outcomes (macrosomia, postpartum hemorrhage, primary CS and LBW) varied in different pre-pregnancy BMI groups and GWG groups. Taller women with excess GWG had a higher risk of macrosomia compared to average height women with excess GWG. Shorter women with inadequate GWG had more than two times the risk of LBW and primary CS compared to women with average height who had inadequate GWG. Excess GWG was a protective factor for postpartum hemorrhage in shorter women. Shorter women with normal pre-pregnancy BMI had an increased risk of low birth weight and primary CS compared to average women with average height. Our findings suggest that maternal height can be used as a reference to identify Chinese women at high risk of adverse outcomes; however, pre-pregnancy BMI and GWG should be considered.
A study showed that pre-pregnancy BMI was independently associated with neonatal birth weight in women with normal glucose tolerance [20]. Higher pre-pregnancy BMI and excess GWG were far more important in macrosomia prediction than other maternal characteristics [21]. However, the rate of women with higher BMI is lower than in western countries [22]. In fact, the prevalence of underweight women is higher in East Asian countries [23,24,25]. Taller height and GDM are two distinct risk factors that could interact to cause macrosomia. According to studies, GDM only had an impact on macrosomia in taller women [8, 9]. Thus, hyperglycemia and excess GWG can be the main contributing factors to macrosomia compared to other factors in Chinese women [22]. Therefore, taller Chinese women with GDM can benefit from strict counseling on appropriate weight gain during pregnancy to decrease the risk of macrosomia.
A study showed that shorter women have a higher risk of LBW [26]. Risk of LBW may decrease with increasing maternal height from < 160.0 cm to 160.0 cm [27]. However, what causes LBW in women of short stature is still unclear. We found that shorter women had a higher incidence of LBW in accordance with previous studies [26, 28]. Inadequate GWG has been reported as a risk factor for LBW, similar to our findings [29]. A study involving Spanish women showed that women who gain inadequate GWG in both the second and third trimesters have increased risk of LBW [30]. On the other hand, a systemic review showed that high GWG was a protective factor against LBW in singleton pregnancy [31]. Malnutrition is known cause of LBW in shorter women; however, for Chinese women, particularly in Zhejiang Province, malnutrition is not the cause of short stature. Contrarily, different studies have shown that the GWG recommendation using IOM guidelines (2009) in Chinese women may not be appropriate; thus, GWG guidelines considering Chinese women's characteristics have been emphasized [32, 33]. Studies have reported that adopting appropriate GWG following Chinese population characteristics may reduce adverse pregnancy outcomes [34, 35]. According to our findings, Chinese women with shorter stature are at increased risk of LBW, particularly those who gain inadequate GWG or with normal pre-pregnancy BMI; clinicians should counsel shorter women on increasing GWG appropriately to decrease the risk of LBW. Nevertheless, further studies are needed to evaluate GWG cutoffs according to Chinese population characteristics.
Additionally, recent studies assessed birth size by birth length, birthweight, head circumference and ponderal index rather than only birthweight, which was associated with adverse preteen cardiometabolic health [36, 37]. Therefore, we further explored the association between maternal height and neonatal ponderal index, which has been researched in few studies. A previous observational cohort study showed that maternal height had no impact on offspring's ponderal index [9]. Another study revealed a significant correlation between infant ponderal index and maternal height for nulliparas but not for the multiparas [38]. We found maternal height was negatively associated with the risk of abnormal neonatal ponderal index in both shorter and taller women with adequate GWG or normal pre-pregnancy BMI, which showed the effect of maternal height on the ponderal index was dependent on GWG and pre-pregnancy BMI. Thus, it is recommended to consider these maternal anthropometric parameters when assessing the birth size. Furthermore, our study lacked offspring’s metabolic indices, and this warrants further study.
According to a research study, increasing maternal height reduces the risk of CS [39]. Also, studies have reported that excess GWG increases risk of delivery by cesarean section [40, 41]. Therefore, it is imperative to counsel shorter women on appropriate GWG during pregnancy. A study showed that overweight and obese pre-pregnancy BMIs were the leading risk factors of primary CS in women of average height, whereas excess GWG was the leading risk factor of primary CS in women of taller stature, similar to our findings [42,43,44]. Another study showed that women with pre-pregnancy BMI > 30 kg/m2 had increased risk of primary CS compared to women with pre-pregnancy BMI < 20 kg/m2 [41]. Excess GWG and obesity increase risk of delivery by cesarean section because of increased abdominal fat, thus hindering abdominal muscle contraction. Strict health education and counseling of women with overweight/obese pre-pregnancy BMI earlier in pregnancy and strict monitoring of GWG might reduce the risk of delivery by CS [45, 46].
Maternal height was previously related to postpartum hemorrhage in singleton pregnancy [47]. In a deep machine learning prediction study model, the relationship between maternal height and postpartum hemorrhage following vaginal delivery was positive [48]. According to one study, the risk of postpartum hemorrhage increased with maternal height (160–170 cm versus 160 cm) [49]. On the other hand, a study showed that shorter stature < 151 cm was significantly associated with risk of postpartum hemorrhage [50]. Another study found that maternal and fetal genes may contribute to postpartum hemorrhage, which may help explain the inconsistency [51]. It is critical to consider the relationship between maternal height and postpartum hemorrhage; however, more extensive studies are required.
To the best of our knowledge, this is the first study to evaluate the relationship between maternal height and adverse outcomes in different pre-pregnancy BMI and GWG groups. Our findings can help clinicians prevent GDM-related adverse outcomes when different maternal heights are considered, as well as pre-pregnancy BMI and GWG.
Limitations of Our Study
Our study had several limitations. First, it is a retrospective study including a small sample from a single health center. Maternal weight and height were self-reported, which might affect the accuracy of the result. Second, data on social demographic characteristics and nutrition status information were not found. Third, the association between maternal height and risk of adverse outcomes was not adjusted for other associated clinical conditions such as cervix incompetence, maternal infections, fetal malpresentation and so on [49]. Thus, further research is needed to evaluate the association between maternal height and adverse outcomes in GDM by BMI and GWG considering relevant clinical conditions.
Conclusion
The relationship between maternal height and adverse pregnancy outcomes varies with pre-pregnancy BMI and GWG in GDM women. Comprehensive counseling and health education considering maternal height and pre-pregnancy BMI and GWG may help prevent adverse outcomes in GDM women.
Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We gratefully thank Women’s Hospital, Zhejiang University School of Medicine, and women who participated in this study.
Funding
This work and its publication, including the journal’s Rapid Service Fee, were funded by the Key R&D Program of Zhejiang Province under Grant 2022C03058, Medical and Health Technology Program of Zhejiang Province under Grant WKJ-ZJ-2324, and 4 + X Clinical Research of Women’s Hospital, School of Medicine, Zhejiang University under Grant ZDFY2022-4XB101.
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Zhaoxia Liang and Danqing Chen contributed to the study conception and design. Mengkai Du and Marie Parfaite Uwimana Muhuza did analysis and drafted the article. All authors contributed to interpretation of the data. Zhaoxia Liang, Danqing Chen, Lixia Zhang, Yibo Tang and Yanmin Chen revised the manuscript for intellectual content. Zhaoxia Liang contributed acquisition of data, analysis and interpretation of data, drafting and revising the manuscript, statistical analysis, and study supervision. All authors have contributed to the proofreading and agreed to the final content of the manuscript for submission. All authors agree to accountability for all aspects of the work.
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Mengkai Du, Marie Parfaite Uwinana Muhuza, Yibo Tang, Yanmin Chen, Danqing Chen, Lixia Zhang and Zhaoxia Liang report no conflict of interest.
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This study was approved by the Human Ethics Committee at Women’s Hospital, School of Medicine, Zhejiang University (IRB-20210269-R). The methods were performed in accordance with the Helsinki Declaration.
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Du, M., Muhuza, M.P.U., Tang, Y. et al. Maternal Height Is an Independent Risk of Adverse Outcomes in Women with Gestational Diabetes Mellitus. Diabetes Ther 15, 461–472 (2024). https://doi.org/10.1007/s13300-023-01512-3
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DOI: https://doi.org/10.1007/s13300-023-01512-3