Changes of second-time mothers and their infants under the universal two-child policy in Changsha, China

Hypertensive disorders of pregnancy in Hunan Province, China, 2012-2022

Objective

To explore the relationship between hypertensive disorders of pregnancy (HDP) and adverse pregnancy outcomes and explore the risk factors for HDP.

Methods

Data were obtained from the Maternal Near-Miss Surveillance System in Hunan Province, China, 2012-2022. Chi-square trend tests (χ2 trend) were used to determine trends in prevalence by year. Unadjusted odds ratios (uORs) were used to examine the association between HDP and adverse pregnancy outcomes. Multivariate logistic regression analysis (method: Forward, Wald, α = 0.05) and adjusted odds ratios (aORs) were used to identify risk factors for HDP.

Results

Our study included 780,359 pregnant women, and 38,397 women with HDP were identified, with a prevalence of 4.92% (95% CI 4.87-4.97). The prevalence of preeclampsia-eclampsia, gestational hypertension, chronic hypertension, and chronic hypertension with superimposed preeclampsia was 2.28% (95% CI 2.25-2.31), 2.04% (95% CI 2.00-2.07), 0.43% (95% CI 0.41-0.44), and 0.18% (95% CI 0.17-0.19), respectively. From 2012 to 2022, the prevalence of HDP increased from 3.11 to 7.39%, showing an upward trend (χ 2 trend = 2220.88, p < 0.01). HDP was associated with the following adverse pregnancy outcomes: maternal deaths (uOR =4.05), maternal near-miss (uOR =6.37), preterm birth (uOR =2.51), stillbirth and neonatal death (uOR =1.45), low birthweight (uOR =4.37), abruptio placentae (uOR =4.45), uterine atony (uOR =1.49), retained placenta (uOR =1.54), puerperal infections (uOR =2.14), abdominal surgical site infections (uOR =2.50), urinary tract infections (uOR =1.60), upper respiratory tract infections (uOR =1.75), heart disease (uOR =2.76), embolism (uOR =2.66), liver disease (uOR =1.25), anemia (uOR =1.38), diabetes mellitus (uOR =2.35), renal disease (uOR =4.66), and pulmonary disease (uOR =4.70, p < 0.05). Results of multivariate logistic regression analysis showed risk factors for HDP: maternal age > 30 years (aOR > 1, p < 0.05), gravidity > = 4 (aOR =1.10, 95% CI 1.05-1.14), primipara (aOR > 1, p < 0.05), and previous cesarean sections (aOR =1.27, 95% CI 1.24-1.31).

Conclusion

The prevalence of HDP was relatively high in Hunan Province. HDP was associated with many adverse pregnancy outcomes. Advanced maternal age, high gravidity, primipara, and previous cesarean section were risk factors for HDP.

The allocation and fairness of hospital pharmacist human resources in China: a time-series study

BACKGROUND

To address the rational use of medicines in healthcare institutions, the Chinese government enacted legislation for pharmacists in 2021, emphasizing the importance of pharmacists in medical services. The allocation and equity of pharmacist human resources in healthcare institutions directly affect people's accessibility to pharmaceutical services. The study aims to analyze the supply and demand of pharmacist human resources in Chinese healthcare institutions and evaluate the equity of their distribution to provide a reference for the rational management of pharmacist resources.

METHODS

This was a time-series study that was conducted using data obtained from Health and Health Statistical Yearbook that is performed every year by the National Health Commission of the People's Republic of China. The study included 31 provinces, municipalities, and autonomous regions and 34,354 medical institutions in mainland China, which were classified into different economic regions based on their level of economic development. The study collected healthcare technicians and pharmacist data from national healthcare institutions between 2016 and 2020. The study evaluated the level of pharmacist human resource allocation using the health resource density index. The study explored the equity of pharmacist human resource allocation from two aspects: population and geographic area, using the Gini coefficient and Theil index.

RESULTS

The average annual growth rates of healthcare technical staff and pharmacists in Chinese medical institutions from 2016 to 2020 were 5.67% and 3.03%, respectively. The Gini coefficients of healthcare personnel resources based on population distribution were all below 0.119, while those based on geographical area were all above 0.655. The total Theil indexes of pharmacist human resources based on population distribution were all below 0.010, while those based on geographical area were all above 0.511. In addition, the contribution rates of the within-group Theil indexes of pharmacist human resources based on population and geographical area distributions to the total Theil index were all greater than or equal to 50%.

CONCLUSIONS

The allocation level of pharmacist human resources in China continues to improve, but there are differences in different economic development areas. Currently, allocation based on population shows equity, but allocation based on geographic area shows inequity. In the future, more attention should be paid to the geographic accessibility of pharmacist human resources, and resource allocation should consider both the population served and geographic area.

The possible impact of the universal two-child policy on pregnancy outcomes

PURPOSE

The implementation of the universal two-child policy contributes to adverse pregnancy outcomes, but how the policy change leads to adverse pregnancy outcomes is not well elaborated. In this study, we aimed to compare maternal characteristics and complications, accessed the change in the proportion of maternal characteristics and maternal complications, and evaluated the mediation of maternal characteristics on maternal complications.

METHODS

Demographic and clinical data of three-level sample facilities were extracted from China's National Maternity Near Miss Obstetrics Surveillance System from Jan 1, 2012 to May 31, 2021. The associations between the universal two-child policy and maternal risk factors, the universal two-child policy and maternal complications, and maternal risk factors and maternal complications were evaluated using multivariate logistic regression analyses, with odds ratios (ORs) and 95% confidence intervals (CIs). Mediation analysis was used to estimate the potential mediation effects on the associations between the policy and maternal complications. Population-attributable fractions (PAF) were conducted to quantify the maternal complications burden attributable to the implementation of the universal two-child policy.

RESULTS

In the context of the universal two-child policy, the incidence of maternal near miss, antepartum or intrapartum complication, and post-partum complication increased at municipal- and county-level sample facilities. After adjusting for covariables, there were significant associations between the universal two-child policy and maternal risk factors (P < 0.001), the universal two-child policy and an increased risk of maternal complications (P < 0.001), and maternal risk factors and maternal complications(P < 0.001). The effects of the universal two-child policy on maternal near miss and medical disease were significantly mediated by maternal risk factors with mediation proportions of 19.77% and 4.07% at the municipal-level sample facility, and mediation proportions for 2.72% at the county-level sample facility on medical disease. The universal two-child policy contributed 19.34%, 5.82%, 8.29%, and 46.19% in the incidence of the maternal near miss, antepartum or intrapartum complication, post-partum complication, and medical disease at municipal-level sample facility, respectively. The corresponding PAF% at county-level sample facility was 40.49% for maternal near miss, 32.39% for the antepartum or intrapartum complication, 61.44% for post-partum complication, and 77.72% for medical disease. For provincial-level sample facility, the incidence of maternal near miss, antepartum or intrapartum complications, and medical diseases decreased (P < 0.05) and no statistically significant difference occurred in the incidence of post-partum complications.

CONCLUSIONS

In the context of the universal two-child policy, the incidence of maternal near miss, antepartum or intrapartum complication, and post-partum complication increased at municipal- and county-level sample facility. Maternal risk factors may play a mediating role in the effect of policy change and maternal complications. Provincial hospitals have been able to improve the quality of perinatal health care and reduce adverse pregnancy outcomes by adjusting their obstetric service strategies in the context of the new birth policy.

The effect of gradually lifting the two-child policy on demographic changes in China

Low-fertility rate has been a common problem in many industrialized countries. To reverse the declining trend of new births, Chinese government gradually lifted its restrictions on the number of births per family, allowing for a household to have no more than two children. Little is known about the additional births or population increase contributed by the gradual relaxation of birth restrictions. To fill this gap, this quasi-experimental design study including data from 124 regions used the synthetic control method and controlled interrupted time series analysis to evaluate the differences in birth rates and rates of natural population increase between China and its synthetic control following implementation of the two-child policy from 2011 to 2020. A total of 123 regions were included in the control pool. Data collected during 1990-2010 were used to identify the synthetic China for each study outcome. The mean rate differences of birth rates and rates of natural increase between China and synthetic China after two-child policy implementation were 1.16 per 1000 population and 1.02 per 1000, respectively. These rate differences were distinguished from variation due to chance (one-sided pseudo-P-values: P for birth rates = 0.047, P for rates of natural increase = 0.020). However, there were statistically significant annual reductions in the pre-post trend of birth rates and rates of natural increase compared with those of controls of <0.340 per 1000 population per year [P = 0.007, 95% CI = (-0.584, -0.096)] and <0.274 per 1000 per year [P = 0.028, 95% CI = (-0.518, -0.031)]. The results suggested that lifting birth restrictions had a short-term effect on the increase in birth rates and rates of natural population increase. However, birth policy with lifting birth restrictions alone may not have sustained impact on population growth in the long run.

Changes in the characteristics and outcomes of high-risk pregnant women who delivered prior to and after China's universal two-child policy: a real-world retrospective study, 2010-2021

BACKGROUND

In 2016, the "universal two-child" policy, allowing each couple to have two children, was introduced in China. The characteristic change of the long-term period after the implementation of the universal two-child policy was unclear. We studied trends in the obstetric characteristics and their potential impact on the rates of cesarean section and preterm birth in the era of China's universal two-child policy.

METHODS

A tertiary center-based study (2010-2021) retrospectively focused single high-risk pregnancies who delivered from the one-child policy period (OCP, 2010-2015) to the universal two-child policy period (TCP, 2016-2021). A total of 39, 016 pregnancies were enrolled. Maternal demographics, complications, delivery mode and obstetric outcomes were analyzed. Furthermore, logistic regression analysis was used to explore the association between the cesarean section rate, preterm birth and implementation of the universal two-child policy, adjusting maternal age, parity, and fetal distress.

RESULTS

Ultimately a total of 39,016 pregnant women met the criteria and were included in this analysis. The proportion of women with advanced maternal age (AMA) increased from 14.6% in the OCP to 31.6% in the TCP. The number of multiparous women increased 2-fold in the TCP. In addition, the overall rate of cesarean section significantly decreased over the policy change, regardless of maternal age, whereas the risk of preterm birth significantly increased in the TCP. Adjusting for maternal age, parity and fetal distress, the universal two-child policy showed a significantly favorable impact on the cesarean section rate (RR 0.745, 95%CI (0.714-0.777), P < 0.001). Compared to the OCP group, a higher increase in fetal distress and premature rupture of membranes (PROM) were observed in the TCP group. In pregnancies with AMA, there was no increase in the risk of postpartum hemorrhage, whereas more women who younger than 35 years old suffered from postpartum hemorrhage in TCP. The logistic regression model showed that the universal two-child policy was positively associated with the risk of postpartum hemorrhage (RR: 1.135, 95%CI: 1.025-1.257, P = 0.015).

CONCLUSIONS

After the implementation of the universal two-child policy in China, the rate of the cesarean section significantly decreased, especially for women under 35 years old. However, the overall risk of postpartum hemorrhage increased in women under 35 years old, while there was no change in women with AMA. Under the new population policy, the prevention of postpartum hemorrhage in the young women should not be neglected.

The allocation and fairness of health human resources in Chinese maternal and child health care institutions: a nationwide longitudinal study

BACKGROUND

In response to an aging population, the Chinese government implemented the three-child policy in 2021 based on the comprehensive two-child policy. With the implementation of the new birth policy, people's maternal and child health (MCH) needs will also increase. The allocation and fairness of MCH human resources directly affect people's access to MCH services. The purpose of this study is to analyze the allocation of health human resources in Chinese maternal and child health care institutions, evaluate the fairness of the allocation, to provide a reference for the rational allocation of MCH human resources.

METHODS

The data of health technicians, licensed (assistant) physicians, and registered nurses in maternal and child health care institutions nationwide from 2016 to 2020 were included. The health resource density index (HRDI) is used to evaluate the allocation level of MCH human resources. The Gini coefficient (G) and Theil index (T) are used to evaluate the fairness of the allocation of MCH human resources from the perspectives of population and geographic area.

RESULTS

From 2016 to 2020, the average annual growth rate of the number of health technicians, licensed (assistant) physicians, and registered nurses in Chinese maternal and child health care institutions was 7.53, 6.88, and 9.12%, respectively. The Gini coefficient (G) of the three types of MCH human resources allocated by population were all below 0.23, and the Gini coefficient (G) allocated by geographical area were all above 0.65. The Theil index (T) of the three types of MCH human resources allocated by population was all lower than 0.06, and the Theil index (T) allocated by geographical area was all higher than 0.53. In addition, the three types of MCH human resources allocated by population and geographic area contributed more than 84% of the Theil index within the group (T_intra) to the Theil index (T).

CONCLUSIONS

China's MCH human resources were fair in terms of population allocation, but unfair in terms of geographical area allocation. In the future, more attention should be paid to the geographical accessibility of MCH human resources, and the allocation of resources should comprehensively consider the two factors of serving the population and geographical area.

The protective role of social support on prenatal depression among pregnant women of advanced maternal age: a Three-Trimester follow-up study in China

The aim of this study was to compare the depressive symptoms during pregnancy between pregnant women aged over 35 years and those aged less than 35 years and to evaluate the protective effect of social support in early pregnancy against prenatal depressive symptoms. One hundred and seventy one women aged over 35 years and 342 trimester-matched women aged less than 35 years were included from a level III hospital in Shenzhen, China. The self-report Edinburgh Postnatal Depression Scale (EPDS) and Social Support Rating Scale (SSRS) were used to evaluate prenatal depression and social support in early pregnancy. The proportions of women aged over 35 years who screened positive for prenatal depression were 22.8%, 23.4%, and 24.0% in the first, second and third trimesters, respectively. Advanced maternal age (≥35 years) was a positive predictor of prenatal depressive symptoms (β = 0.747, P = 0,008). Social support, especially objective support (β = -0.030, P = 0.002) and subjective support (β = -0.028, P = 0.006) in early pregnancy, had stronger protective effects against prenatal depressive symptoms for women aged over 35 years than younger women. Our findings support that older pregnant women experience more depressive symptoms than younger pregnant women, and social support could serve as a targeted intervention to decrease prenatal depressive symptoms.Impact statementWhat is already known on this subject? Depressive symptoms, which are strongly associated with adverse psychosocial and birth outcomes, appear to be prevalent and change in nature. Social support is an important protective factor against prenatal depression.What the results of this study add? Pregnant women of advanced maternal age experienced more depressive symptoms than younger women during the prenatal period. Social support, especially objective support and subjective support, had stronger protective effects against prenatal depression for women aged over 35 years than women aged less than 35 years.What the implications of these findings are for clinical practice? Screening of prenatal depression should be strengthened, especially for women aged over 35 years, and improving subjective support could improve their emotional experience.

Mediating role of perceived social support in the relationship between perceived stress and job burnout among midwives in the post-COVID-19 era

AIM

The aim of this study was to explore the mediating role of perceived social support in the association between perceived stress and job burnout in midwives.

DESIGN

A descriptive, cross-sectional online survey.

METHODS

Using the stratified cluster sampling method, 329 midwives in 20 hospitals in China were selected as the participants. They completed self-report assessment measures of job burnout, perceived stress and perceived social support.

RESULTS

63.5% of the participants had job burnout. Perceived stress was negatively associated with social support (r = -.350, p < .01), while it was positively associated with job burnout (r = -.382, p < .01). Social support was negatively correlated with job burnout (r = -.569, p < .01). The total effect of perceived stress on job burnout was 0.474 (95% CI: 0.367 ~ 0.596, p < .01), the direct effect was 0.242 (95% CI: 0.142 ~ 0.355, p < .01), and the indirect effect was 0.232 (95% CI: 0.160 ~ 0.316, p < .01). Social support programmes for midwives should be implemented to control the impact of perceived stress on job burnout.

Burden of maternal disorders in China from 1990 to 2019: Analysis of the Global Burden of Disease Study 2019

Background

Efforts to quantify the burden of maternal disorders at the national and provincial levels are valuable for resource allocation and for development and adoption of public health policies.

Methods

Following the methods of the Global Burden of Diseases, Injuries, and Risk Factors Study 2019, the prevalence of maternal disorders and the resulting disability-adjusted life years (DALYs), years lived with disability(YLD), deaths, and years of life lost (YLL) at the national and provincial levels in China were examined for the 1990–2019 period. Estimated annual percentage changes (EAPCs) were calculated to estimate the trends of age-standardized rate (ASR) of prevalence, DALYs, death, and YLD due to maternal disorders and its main subcategories from 1990 to 2019.

Findings

In 2019, China had an estimated 0.85 million cases of maternal disorders (95% uncertainty interval: 0.65–1.08 million), with a 73% decline in absolute numbers from 1990 to 2019. The ASR of prevalence, DALYs and death for overall maternal disorders showed decreasing trends in China from 1990 to 2019 with the EAPCs being −3.25(95% confidence interval [CI] = −3.86 to −2.64), −8.07 (95% CI= −9.14 to −6.98), and −7.04 (95% CI= −7.99 to −6.07), respectively. The most pronounced decreases in trends in ASR of prevalence, DALYs and death were observed for maternal hemorrhage. Shandong, Hong Kong, Macao showed no significant trends in ASR of prevalence. Notably, the trends in ASR of prevalence due to maternal hypertensive disorders had been stable in China and most provinces. The trends in ASR of DALYs and death decreased the most in Jiangxi province.

Interpretation

The disease burden of prevalence, DALYs and death for overall maternal disorders decreased significantly in China from 1990 to 2019, however, the trends in ASR of prevalence due to maternal hypertensive disorders had been stable in China and most provinces.

Funding

The study is supported by grants from the Innovative Talent Support Plan of the Medical and Health Technology Project in Zhejiang Province (2021422878), Ningbo Science and Technology Project (202002N3152), Ningbo Health Branding Subject Fund (PPXK2018–02), Sanming Project of Medicine in Shen-zhen (SZSM201803080).

Factors associated with child delivery expenditure during the transition to the national implementation of the two-child policy in China

BACKGROUND

This study aimed to analyze the status of birthrates and the characteristics of child delivery expenditure under the Chinese two-child policy's transition period. We evaluated the socioeconomic factors associated with child delivery and provide evidence for decisions relating to health support for childbirth.

METHODS

Child delivery expense data were obtained from 2015 to 2017 in Dalian, China. A total of 13,535 obstetric records were enrolled using stratified random sampling and the proportional probability to size method. First, we calculated the current curative expenditure of child delivery and health financing in childbirth costs based on the System of Health Accounts 2011 (SHA 2011). Second, univariate analysis of variance and generalized linear modeling were performed to examine factors associated with child delivery expenditure. Third, we classified the included hospitals into the county, district, and municipal hospitals and compared maternal characteristics between these categories.

RESULTS

Overall, out-of-pocket payments accounted for more than 35% of the total expenditure on child delivery. Median (interquartile range) delivery expenditure at the county and district level hospitals [county-level: 5128.50 (3311.75-5769.00) CNY; district-level: 4064.00 (2824.00-6599.00) CNY] was higher than that at the municipal level hospitals: 3824.50 (2096.50-5908.00) CNY. The increase of child delivery expenditure was associated with an increased ratio of reimbursement, admissions to county and district level hospitals, cesarean sections, and length of stay, as well as a decline in average maternal age (p < 0.05).

CONCLUSIONS

Health financing for childbirth expenditure was not rational during the transition period of the family planning policy in China. Higher delivery expenditure at county and district level hospitals may indicate variations in medical professionalism. Poorly managed hospitalization expenditure and/or nonstandard medical charges for childbirth, all of which may require the development of appropriate public health policies to regulate such emerging phenomena.

Trends in cesarean delivery rates in primipara and the associated factors

Background

Few studies have focused on cesarean delivery (CD) trends among primipara under the one-child and the two-child policies. This study aimed to explore the trends in CD rates among primipara during 1995–2019 and the associated factors with CD risk.

Methods

This study obtained clinical data on primiparous mothers and newborns from 1995 to 2019 at a large tertiary hospital in Wuhan, China. Trends in CD rates were calculated using the joinpoint regression analysis. The Chi-square tests and log-binomial regression analyses were used to evaluate the associations between primary variables and CD risk.

Results

CD rates showed a significant upward trend with an average annual percentage change (APC) of 2.2% (95% CI: 0.6, 3.8%) during the study period. In 1995–2006, the CD rates continued to increase with an APC of 7.8% (95% CI: 4.8, 10.9%). After 2006, the CD rates started to decline by an APC of − 4.1% (95% CI: − 5.5, − 2.6%). The CD rates non-significantly increased from 36.2% in 2016 to 43.2% in 2019. Moreover, the highest CD rate during 2015–2019 was observed on August 30 (59.2%) and the lowest on September 1 (29.7%). Primipara of older age and those with >3pregnancies had higher risks of CD. Furthermore, primipara who gave birth to newborns with low birth weight and macrosomia had higher risks of CD.

Conclusions

Maternal and fetal as well as social and cultural factors may contribute to the rising trend of CD rates. Effective measures should be taken to control CD under the two-child policy, especially for primipara.

Supplementary Information

The online version contains supplementary material available at 10.1186/s12884-020-03398-6.

Comparison of midwives' self-perceived essential competencies between low and high maternal mortality ratio provinces in China

AIMS AND OBJECTIVES

To present and compare midwives' self-perceived essential competencies in regions with different maternal mortality ratios, and explore possible competency-related factors.

BACKGROUND

In China, there is an urgent need for high-quality maternal health care with equal access, as the regional disparity in the maternal mortality ratio remains a big challenge. Midwives' essential competencies refer to the minimum knowledge, skills, and professional behaviours required by midwives, and directly affect the quality of maternal care they provide. However, there is very limited literature evaluating Chinese midwives' essential competencies, especially for midwives working in regions with high maternal mortality ratios.

DESIGN

A cross-sectional survey design.

METHODS

The national cross-sectional study using an online questionnaire was conducted with a convenience sample of 2,022 midwives working in regions with different maternal mortality ratios. The STROBE guideline for cross-sectional studies was used in this study.

RESULTS

Midwives rated themselves higher on their essential competencies in intrapartum care and lower on their essential competencies in assisting or performing the operative vaginal delivery. Specifically, when compared to those from regions of low maternal mortality ratios, midwives from regions with high maternal mortality ratios reported comparatively poor self-perceived essential competencies, especially in the area of detecting and treating pregnancy and childbirth-related complications. The factors influencing midwives' self-perceived essential competencies included majors, education levels, years of experience as a midwife, participation in teaching, and access to in-service training.

CONCLUSION

In regions with high maternal mortality ratios, improving midwives' essential competencies is a key priority. Furthermore, it is recommended that midwifery education could be conducted in universities, and relevant regulations could be developed to enable midwives to provide a wider scope of care, thereby promoting the development of the midwifery workforce in China.

RELEVANCE TO CLINICAL PRACTICE

Understanding self-perceived essential competencies of Chinese midwives working in regions with different maternal mortality ratios could guide the midwifery workforce, management, especially midwives' capability building.

Birth and birth-related obstetrical characteristics in southwestern China associated with the current adjustment of family planning policy: a 7-year retrospective study

In China, the adjustment of the family planning policy was expected to increase the number of births and trigger a change in the demographic and obstetrical background of pregnant women. The policy itself, and corresponding background variations of the pregnant mothers, might have various influences on certain birth-related characteristics. Moreover, the adaption of the medical system to the policy needs to be demonstrated. To address these issues, over 50,000 individual records from January 2012 to December 2018 were collected from a large tertiary care centre of southwest China as a representative. The monthly numbers of deliveries and births showed stabilized patterns after remarkable upward trends. Policy-sensitive women, among whom older age and multiparity were typical features, contributed considerably to the remarkable additional births. Indeed, multivariable logistic regression analysis identified the child policy and these two background characteristics as factors influencing CS (caesarean section) rate and certain pregnancy complications or adverse outcomes. After the implementation of the two-child policy, a care provider was faced with fewer but more difficult cases. Briefly speaking, more individual-based studies on family planning policy and more efforts to improve obstetrical service are needed to better guide clinical practice in the new era.

Equity and efficiency of maternal and child health resources allocation in Hunan Province, China

BACKGROUND

A reasonable allocation of health resources is often characterized by equity and high efficiency. This study aims to evaluate the equity and efficiency of maternal and child health (MCH) resources allocation in Hunan Province, China.

METHODS

Data related to MCH resources and services was obtained from the Hunan maternal and child health information reporting and management system. The Gini coefficient and data envelopment analysis (DEA) were employed to evaluate the equity and efficiency of MCH resources allocation, respectively.

RESULTS

The MCH resources allocation in terms of demographic dimension were in a preferred equity status with the Gini values all less than 0.3, and the Gini values for each MCH resources' allocation in terms of the geographical dimension ranged from 0.1298 to 0.4256, with the highest values in the number of midwives and medical equipment (≥ CNY 10,000), which exceeds 0.4, indicating an alert of inequity. More than 40% regions in Hunan were found to be relatively inefficient with decreased return to scale in the allocation of MCH resources, indicating those inefficient regions were using more inputs than needed to obtain the current output levels.

CONCLUSIONS

The equity of MCH resources by population size is superior by geographic area and the disproportionate distribution of the number of medical equipment (≥ CNY 10,000) and midwives between different regions was the main source of inequity. Policy-makers need to consider the geographical accessibility of health resources among different regions to ensure people in different regions could get access to available health services. More than 40% of regions in Hunan were found to be inefficient, with using more health resources than needed to produce the current amount of health services. Further investigations on factors affecting the efficiency of MCH resources allocation is still needed to guide regional health plans-making and resource allocation.

Associations of maternal ambient temperature exposures during pregnancy with the risk of preterm birth and the effect modification of birth order during the new baby boom: A birth cohort study in Guangzhou, China

Maternal exposures to ambient temperatures during pregnancy may increase the preterm birth (PTB) risk; however, which periods have stronger effects remain controversial. The effects of temperature exposure on PTB in first- and second-born neonate groups may be different during the new baby boom that has followed the Two-child Policy in China. We examined a birth cohort of 4928 pregnant women beginning in 2016 in Guangzhou, China. An inverse distance weighted method was used to estimate the temperature exposure at each individual residential address. A distribution lag non-linear model incorporating a Cox proportional hazard model was employed to estimate the effects of temperature exposure on PTB and test the effects modification of birth order related to the new baby boom. A total of 4101 pregnant women were included, of which 234 (5.7%) experienced PTB. Compared with the mean temperature (23.0 °C), we found a significantly higher risks of PTB associated with high temperatures (i.e, 30 °C [95th centile]) from the 4th to 8th, and 22nd to 27th gestational weeks. A peak effect was found during the 6th week (HR = 1.79, 95% CI: 1.26, 2.54) and 24th week (HR = 1.83, 95% CI: 1.27, 2.62). The risks of PTB were reduced for low temperatures (i.e. 14 °C [5th centile] versus 23.0 °C) from the 2nd to 10th and 20th to 26th gestational weeks, and the negative peak effect was found during the 4th week (HR = 0.43, 95% CI: 0.26, 0.72) and 23rd week (HR = 0.59, 95% CI: 0.43, 0.83). Stratification analyses showed that significant effects of 30 °C versus 23 °C on PTB were observed during the 4th to 8th weeks in the second-born neonate, and the peak effect was found in the 6th week (HR = 2.13, 95% CI: 1.31, 3.47). However, we did not find significant effects of 30 °C during the same weeks in the first-born neonate group. Maternal exposures to higher temperatures during pregnancy may increase the risk of PTB, and lower temperatures may decrease the risk of PTB. Stronger effects of temperature exposures during the first trimester on PTB risk were found among the second-born neonates than among the first-born neonates.