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Unraveling the complexity of selected adverse neonatal outcomes in India: a multilevel analysis using data from a nationally representative sample survey
BMC Pregnancy and Childbirth volume 25, Article number: 377 (2025)
Abstract
Introduction
The burden of adverse neonatal outcomes (ANOs), encompassing preterm birth(PTB), low birth weight(LBW), and early neonatal deaths, remain significant public health challenge globally, particularly in developing countries. The study aims to provide estimates of adverse birth outcomes and examine their correlates by using a multi-level model analysis at individual/household/community level.
Methodology
The study has chosen three ANOs such as preterm birth(PTB), low birth weight(LBW), and early neonatal deaths (based on available data) for constructing a combined indicator which is calculated by the presence of any one of these variables. We used National-Family-Health-Survey India data(2019–21). Multilevel(three-level) logistic regression model was used to find the probability of binary adverse neonatal outcomes with the effects of individual/household/community level variables among the recently delivered women.
Result
Between 2019–21, a total of 26.5% ANOs were reported from 1.7 million pregnant women surveyed, a rate that has increased since 2005–06 (20%). Final multilevel model asserts that women having higher education [OR 0.92, 95%CI 0.88, 0.96), and those registered for antenatal checkups (OR 0.95, 95%CI OR 0.9, 0.99) and know all components of birth-preparedness-and-complication-readiness (OR 0.88, 95%CI 0.84, 0.92) have a higher protective odd of having adverse outcomes. Difficulty in seeking medical help (OR 1.2, 95%CI 1.15, 1.25) and belonging to poor wealth status and no intention to become pregnant (OR 1.11 95% CI 1.05, 1.18) acts as a risk factor. Multilevel model with household, community and district level variables added to the null model showed a decline in the ICC values to 4.7%, 18.8% and 30.9% respectively across district, community, and household levels.
Conclusion
The study underscores that specific ANOs in India has shown an increase, prompting significant concern. There is need to institute a mechanism for generating knowledge amongst women to protect them from unwanted pregnancies and later adverse outcomes.
Background
The burden of adverse neonatal outcomes [1,2,3,4] (ANOs), encompassing preterm birth, low birth weight, and early neonatal deaths, remain significant public health challenge globally, particularly in developing countries. These outcomes not only affect the immediate health of newborns but also have long-term implications on their development and well-being [5]. The global estimates of preterm birth is 10.6%, accounting for approximately 15 million each year [6] and about one in every seven newborn is born with low-birth weight (LBW) [7], which is over 20 million [8] each year. Preterm birth and LBW are significant contributors to neonatal mortality [9, 10] and strongly indicate potential growth issues and nutritional deficiencies in children, affecting their physical and cognitive development in later stages of life [11, 12]. In 2019, about half of all under-5 deaths occurred globally in the first 28Â days of life, of which three-fourth died in the first week [13]. South Asia, being significantly affected accounts for more than one-third of the burden of pre-term birth [14], and nearly half of the burden of LBW [15].
India continues to grapple with a high burden of ANOs despite of making progress in various health indicators. Approximately 12% of children were born preterm, and 18% had low birth weight in India during 2019–21 [16], which is higher than its neighboring countries such as Sri Lanka, Nepal, Myanmar, and China [17]. Preterm birth and LBW are responsible for approximately 28% [18] and 60% [19] of neonatal deaths respectively in India.
These adverse neonatal outcomes are affected by a variety of determinants. Previous studies have shown that maternal individual factors, such as maternal age, height, weight, any chronic health conditions, particularly hypertensive disorders and diabetes [9, 16, 20,21,22,23,24]; lifestyle factors, such as smoking, tobacco intake, alcohol, and drug use during pregnancy [20, 21]; and socio-demographic factors, such as wealth status, education level, residence, and environmental factors [16, 22, 23, 25, 26] contribute significantly to the increased risk of ANOs. Additionally, obstetric factors such as previous history of adverse birth outcome, any pregnancy complication, birth order, and potential risk factors during pregnancy were highly associated with adverse neonatal outcomes [16, 24, 27, 28]. Other factors such as inadequate antenatal care [24, 26, 27, 29, 30], inadequate intake of Iron Folic Acid (IFA) supplements during pregnancy [8, 31], sanitation practices by mothers [32], environmental pollution [33,34,35], and violence [36] were considered as risk factors for pre-term birth and LBW.
In order to prevent these ANOs, a number of programmatic initiatives and policies have been dedicated in recent years by Government of India and different state government. These include promoting early registration of pregnancy, improving the quality antenatal checkups, promoting institutional deliveries by reducing out of pocket expenses through different schemes like Janani Shishu Suraksha Karyakram (JSSK) and Janani Suraksha Yojana (JSY) program, skilled birth attendants, kangaroo mother care, postnatal check-ups for both the mother and the newborn, early initiation of breastfeeding, exclusive breastfeeding, age-appropriate supplementary feeding, immunization, and home-based newborn and young child care [13, 18, 37, 38]. Implementation of these programs contributes to significant progress in reducing neonatal mortality rate (NMR) over the last decade from 31 per 1000 livebirths in 2011 [39] to 20 per 1000 livebirths in 2020 [40]. However, it is still irreconcilably high for a country that aspires to achieve Sustainable Development Goal target 3.2 (SDGs) related to child survival.
Despite decades of research investigating risk factors for adverse neonatal outcomes, most of the studies [16, 23, 26, 32] have assessed only household and individual factors. Gaps remain in understanding how community and health seeking factors might contribute to the neonatal outcomes. In the global context, studies have demonstrated that, community-level factors have also an impact on individual level health outcomes [41,42,43] particularly in developing countries. These factors may be potentially important for understanding population-based shifts in distribution of risk factors associated with the outcomes. Therefore, along with individual and household level factors, community-based determinants are crucial for more comprehensive understanding of the risk factors.
Thus, given the background, the purpose of this paper is to provide estimates and trends of selected adverse neonatal outcomes and examine their correlates by using a multi-level model analysis at individual, household, and community level. This study uses the latest nationally representative data from National Family Health Survey (NFHS)−5 of India 2019–2021. This study offers a comprehensive analysis of factors influencing adverse neonatal outcomes, furnishing vital insights for crafting policy decisions and intervention strategies to enhance newborn health.
Methods
Data and samples
The analysis is based on data gathered from India’s National Family Health Survey (NFHS) of its fifth round. The NFHS is one of large-scale, multi-round survey conducted in representative samples throughout all the states and union territories of India. It compiles information about fertility and mortality, reproductive, maternal, child and adolescent health status, healthcare utilization, high risk behaviors, domestic violence, etc. The data used for this study has been downloaded from DHS data program portal after the prior registration and permission. There are no identifiers in the data which is available in the public domain thus has no ethical implication. [44]
Although literature suggests range of ANOs [1,2,3,4] but based on available data in NFHS, the study has chosen three adverse neonatal outcomes from individual data set such as Low Birth Weight (birth weight ≤ 2500 gm), Pre-term birth (Birth ≤ 37 Weeks of pregnancy period) and Early Neonatal death (death happened between 7 or below days) for constructing a combined indicator for adverse outcomes. An adverse neonatal outcome is calculated by the presence of any one of the following three variables. Out of 724,115 participants’ information for the last five years survey period which is available in this data set, the study chose latest pregnancy (this analysis considered only the most recent pregnancy information) outcomes of 174,947 mothers for the analysis. This selection was done to explore medical level variables which are available for the latest pregnancy only.
Conceptual framework
An intricate web of maternal determinants spanning individual, household, and community levels, as well as factors within the healthcare system can contribute to the occurrence of adverse neonatal outcomes. Through an extensive review of literature, a comprehensive range of variables [5, 45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61] was identified and later included in the framework for further analysis (Fig. 1).
For comprehensive analysis, we have categorized the variables into individual factors, which encompass obstetric-related factors, maternal individual factors, and factors related to health service utilization. Additionally, household-level and community-level factors were also included in the analysis. These existing variables not only provided critical insights into socio-demographic and economic characteristics but also into health service utilization and associated factors (Fig. 1).
Outcome of interest and list of variables
The ANOs among the latest births consists of pre-term births, LBW and Early Neonatal deaths, compositely labelled as the outcome indicator. To understand the association between ANO and background characteristics of mothers, the study considered twenty-two explanatory variables for the analysis. These variables comprise of Individual level factors such as High-risk fertility behavior, Mother's educational Status, Height of the mother, Tobacco or alcohol consumption by mother, Intention to become pregnant, received ante-natal care (ANC), ANC registration status, Timing of first ANC checkup, Number of ANC checkups, Perceived Birth Preparedness and Complication Readiness (BPCR), Getting medical help for self is problem, Perceived quality of antenatal checkups, Experienced complications; Household level factors that includes Wealth index, Sex of the household head, Source of drinking water, Type of cooking fuel, Media Exposure, Family size, Caste, and Religion; Community level factors such as Residential Status, Women community education status, women community economic status, Region (S1 Appendix).
For further analysis we have formed various composite indexes using various dichotomous/ nominal/ ordinal variables.
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‘High Risk Fertility Behavior’ which is defined as exposure of women to any of the following three demographic risks at their last childbirth: maternal age ≤ 18 years or ≥ 35 years, birth order ≤ 4, and birth interval < 24 months.
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‘Birth Preparedness and Complication readiness’ (BPCR, Cronbach α = 0.90) BPCR was computed by summing up the scores from eleven variables like if women were told about complications due to: vaginal bleeding, convulsions, prolonged labor, severe abdominal pain, high blood pressure; Importance of: institutional delivery, cord care, breast feeding, keeping baby warm, family planning and where to go for pregnancy complications/delivery. This composite score ranges between ‘0’ and ‘11’, further categorized as ‘No BPCR’, ‘1–10 BPCR’ and ‘All BPCR’.
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‘Getting medical help for self is problem’ (Cronbach α = 0.88): DHS collects information on women facing any difficulty in seeking medical help. This information ranged from problems concerning permission to go, getting money needed for treatment, distance to health facility, having to take transport, not wanting to go alone, concern no female health worker, concern no provider, concern no drugs available. A score was generated using these variables named. The score ranges between ‘0’ and ‘16’ which was further categorized as ‘0-No’, ‘1–5 – Low’, ‘6–10 – Moderate’ and’11–16 – High’.
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‘Perceived quality of antenatal checkups’ (Cronbach α = 0.75): The score for perceived quality from five ANC has been calculated by aggregating each service score. These ANC services during pregnancy are weight measurement done regularly, blood pressure taken, urine sample taken, blood sample taken as well as given/taken iron tablet/syrup. The total score ranges between ‘0’ and ‘5’ and further categorized as ‘0–4 – None/Some’ and ‘5- All’.
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‘Experienced complication’ (Cronbach α = 0.62): This was estimated from five types of complications experienced by mothers during the pregnancy such as convulsions not from fever, swelling of the legs, body or face, breech presentation, prolonged labor, and excessive bleeding. The total score ranges between ‘0’ and ‘5’ and categorized as; ‘0 – No’, ‘1- Anyone’, ‘2 – Any two’ and ‘3–5 – Three & Above’.
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The study also constructed community level variables such as Maternal community Education status and Maternal community Economic status by aggregating household characteristics for the respondents to the community level (Primary Sample Units-PSUs). DHS provides household Wealth Index (WI) based on information collected on household amenities and assets. Based on state level household wealth index score, the community level economic status was categorized as ‘high’ and ‘low’ where the ‘high’ indicates those PSUs that are higher in terms of WI than that of state average and ‘low’ for the remaining. Similarly, community women educational index is created based the average years of schooling of women at the PSU level. Remarkably, this index is based only on the information of women aged 15–49 years since others were not part of survey.
Statistical analysis
The study employed both descriptive and inferential statistics for the analysis. First, percentage prevalence of adverse neonatal outcomes from NFHS-3, NFHS-4 and NFHS-5 rounds of survey were estimated. For detailed analysis i.e., bivariate and multilevel analysis we have only considered NFHS-5 data. Bivariate analysis was performed to examine the adverse neonatal outcomes with various individual, household as well as community level factors as explained in the conceptual framework. The initial bivariate analysis was conducted with χ2 test for ordered categorical variables. The study also employed Un-adjusted logistic regression (Odds Ratio) to check the statistical validity of such relationship. Later those with a significant difference (P < 0.05) and those biologically plausible were selected for the adjusted analysis.
Subsequently, multilevel (three level) logistic regression model was used to find the probability of binary adverse neonatal outcomes (No = 0, Yes = 1) with the effects of individual, household, and community variables among the recently delivered women. We have used random effect model of multiple logistic regression for the same. Within the multilevel analysis, we used the Intraclass Correlation Coefficient (ICC) to assess the proportion of total variance in adverse neonatal outcomes attributed to the differences at the individual, household, and community level variables. ICC helps determine whether multilevel modeling is appropriate by quantifying the degree of similarity in outcomes within clusters where a higher ICC implies significant portion of the variance due to clustering effects rather than individual-level factors. All statistical analysis was conducted through the statistical software STATA-Version 17.
Result
Sample characteristics
From a sample of 724,115 women delivered in past five years preceding the survey, we have included information from recently delivered women having 174,947 live births to capture variables stated in the framework (Fig. 1). The information is from nationally representative sample survey, including 707 districts and 36 states/union territories of India. Between 2019–21, a total of 26.5% (46,342 out of 174,947) adverse outcomes were reported, a rate that has increased since 2005–06, when 20% (8315 out of 19,764) adverse outcomes were documented (Fig. 2).
The prevalence of ANO was higher amongst women having high risk fertility behavior (27.7%), having height less than or equal to 150 cm (29%), and those who consume tobacco or alcohol (27.2%). It is imperative to note that those women who did not receive any antenatal checkups (28.2%), or even registered for ANC (28.9), had no knowledge about the birth preparedness and complication readiness components (28.4%), who felt that healthcare seeking was a problem due to family reasons (28.8%), perceived quality of ANCs as poor and had experienced any complication during pregnancy(80.3%) had higher ANOs (Table 1).
At household level women belonging to poor wealth status (28.3%), using unclean fuel (27.6%), no media exposure (28.7%), family size more than 6 (27.0%), belonging to OBC caste (27.6%), and belonging to Hindu religion (26.8%) had higher adverse outcomes. At the community level, women residing in the rural areas (27.1%), having poor maternal community education (28.4%) and economic status (27.5%) and residing in the central region (29.7%) had higher ANOs (Table 1).
Results of bivariate and regression analysis
The results from bivariate analysis elucidate that odds of having adverse outcomes are marginally more amongst women having HRFB and having no intention for current pregnancy. A disaggregated analysis by maternal age noted no significant difference of ANOs between different age groups. Protective factors include good maternal height (OR 0.78; 95% CI 0.76, 0.80), higher education (OR 0.76; 95% CI 0.73, 0.78), ANC registration (OR 0.88; 95% CI 0.84, 0.92), ANC checkups (OR 0.91; 95% CI 0.87, 0.95), More than 4 ANC checkups (OR 0.82, 95% CI 0.78, 0.85), having knowledge about BPCR (OR 0.86; 95% CI 0.82, 0.89), women perceiving better quality of ANC (OR 0.89; 95% CI 0.86, 0.91) and having no complication during delivery also showed a protective odds of having adverse outcomes. Difficulty in seeking healthcare was also a risk factor.
Higher the wealth status (OR 0.78; 95% CI 0.76, 0.81), using clean fuel for cooking (OR 0.89; 95% CI 0.87, 0.91), having media exposure (OR 0.86; 95% CI 0.84, 0.88) and belonging to Muslim and other religion showed a protective odd of having ANOs. Within the community level variables belonging to rural areas (OR 1.12, 95% CI 1.09, 1.15), having poor maternal community education (OR 1.12, 95% CI 1.09, 1.16) and economic status (OR 1.07, 95% CI 1.04, 1.09) presented as risk factors.
Multilevel logistic regression analysis incorporated variables identified as significant in the bivariate analysis or are biologically plausible. Our analysis was conducted across three distinct models: Model I included explanatory variables at the individual level, Model II integrated variables from both individual and household levels, while the final model i.e., Model III encompassed all significant variables from the bivariate analysis or deemed biologically plausible from individual, household, or community levels (Table 2). Result from the model III asserts that women having higher education [OR 0.92, 95% CI 0.88, 0.96), with good height (OR 0.8, 95% CI 0.77, 0.82) and those who have registered for antenatal care checkups (OR 0.95, OR 0.9, 0.99) and know all the components of birth preparedness and complication readiness (OR 0.88, 95% CI 0.84, 0.92) have a higher protective odds of having adverse outcomes. It is imperative to note that difficulty in seeking medical help (OR 1.2, 95% CI 1.15, 1.25) and no intention to become pregnant (OR 1.11*** 95% CI 1.05, 1.18) is a risk factor for having adverse neonatal outcome(Table 2).
Further individual and community level variables assessment explains that in comparison to women belonging to poor wealth status those belonging to higher wealth status showed a higher protective odd of adverse outcomes. Women from Schedule tribe (OR 0.91, 95% CI 0.87, 0.95), belonging to Muslim (OR 0.95, 95% CI 0.92, 0.99) and other religion (0.92, 95% CI 0.87, 0.98) have also shower a lower risk of having adverse outcomes(Table 2).
Null model, a model without covariates analyzed using multilevel modeling of adverse neonatal outcomes (Table 3) presented a significant amount of variation across families, communities, and districts. The null model, which doesn't include any covariates, indicates significant variation in adverse neonatal outcomes across different levels: 6.2% of the variation is explained by district-level differences, 19.7% by community-level, and 31.3% by household-level differences. This suggests that these factors play a substantial role in influencing adverse neonatal outcomes (Table 3).
Result from the model III that is the model with household, community and district level variables added to the null model showed a decline in the ICC values to 4.7%, 18.8% and 30.9% respectively across district, community, and household levels indicating that these variables account for some of the variation observed in the null model. This reduction in ICC values signifies that the included covariates help explain the variation in adverse neonatal outcomes across different levels, providing insights into how these factors contribute to the observed outcomes (Table 3).
Discussion
Our analysis on repeated large scale nationally representative data indicated that a total of 26% ANOs were reported from 1.7 million pregnant women surveyed, that has increased from 2005–06 to 2019–21. Preterm births have declined from 25.4% to 12.4%, early neonatal mortality has reduced from 3.8% to 1.4% while LBW has increased from 15.7% to 16.4%. Higher education, good knowledge about birth preparedness and complication readiness are protective against ANOs while difficulty in seeking medical help is a risk factor. The individual, household and district level factors explain 30% of the variation in ANO.
In line with other published literature, our descriptive analysis found that the prevalence of ANO was higher amongst women having high risk fertility behavior [59, 60] and those who consume tobacco or alcohol [50]. Literatures have emphasized the importance of antenatal checkups [54] and knowledge about birth preparedness and complication readiness components [53]. Various socioeconomic variables were also found to increase risk of having adverse outcomes like using unclean fuel [47, 48] and drinking water, having no media exposure, residing in rural area, and having low maternal community and economic status.
Scholarly literature indicates that among other social factors pertaining to mothers, education has been identified as the most influential determinant of health outcomes along with the wealth status [52]. In line with this finding and other literatures [56, 57, 62], our study also noted that women having higher education have less odds of having adverse outcomes. This could be due to various factors including better access to healthcare services, improved health literacy, enhanced decision-making skills regarding their own health and that of their children, greater economic resources, and increased social support networks. Additionally, higher education or better wealth status often correlate with healthier lifestyle choices and behaviors, contributing to better overall health outcomes for women and their offspring.
Another key finding suggests that women who do not intend to become pregnant have higher odds of having ANOs. Limited autonomy over reproductive and family planning choices in the patriarchal society of India, might lead to unintended pregnancies. This lack of autonomy may result in inadequate prenatal care and unhealthy practices, increasing the risk of ANOs due to societal expectations and restricted access to healthcare resources. The absence of intended pregnancy may lead to delays in seeking medical attention and adopting unhealthy prenatal practices, ultimately increasing the risk of adverse outcomes for both mother and child.
Birth preparedness is an essential component of safe motherhood programs; a recent study reported lower prevalence of BPCR in India [53]. Various other primary studies have reported a positive correlation between knowledge about all BPCR components and lower risk of adverse outcomes [49]. BPCR strategies usually include preparing for emergencies and building support networks. These help women to be ready to handle any complication during childbirth or pregnancy. Its knowledge empowers individuals to recognize warning signs and seek timely healthcare interventions, thus minimizing the likelihood of complications escalating into adverse outcomes. Also, effective birth preparedness ensures access to skilled birth attendants, appropriate medical facilities, and necessary resources, optimizing the chances of safe delivery and postnatal care. Not only women, but it’s also the family as a whole that should be the focus for BPCR.
ANOs have been defined differently by different researchers [23, 63,64,65,66,67]. While preterm birth, LBW and early NMR have been consistent inclusions, there are factors such as congenital malformations, post term birth, maternal mortality, neonatal mortality beyond 7Â days variedly reported by several studies. Hence this precludes comparison between studies.
Another finding of this study was that women from Schedule tribes have a lower risk of having adverse outcomes. This lower risk can be attributed to various socio-cultural and healthcare factors specific to these populations [61]. Schedule tribe communities often have strong social support systems and traditional practices that prioritize maternal and child health, which could contribute to better outcomes. Additionally, targeted healthcare interventions and initiatives tailored to these marginalized populations may also play a role in mitigating adverse outcomes.
Our study also revealed that there is a significant difference in adverse neonatal outcomes among families, communities, and districts. This implies that the risk of adverse outcomes varies from one family to another, from one community to another, and from one district to another. The study further indicates that after including selected variables in our analysis, the differences in adverse neonatal outcomes across these levels decreased. This reduction in variability suggests that the included variables partly explain the observed differences, indicating that by addressing these factors, it's possible to reduce the disparities in neonatal outcomes among different families, communities, and districts. This finding is crucial for public health, as it points to the potential for targeted interventions to improve neonatal outcomes by addressing specific risk factors at each level.
To concentrate on the increasing trend of ANOs in India, comprehensive programs to promote birth preparedness and complication readiness are required. Additionally, there is need to institute a mechanism for generating knowledge amongst women to protect them from unwanted pregnancies and later adverse outcomes.
ANO could be defined by encompassing several factors other than preterm births, LBW, and early neonatal mortality such as small for gestational age, low APGAR score, birth defects, late neonatal deaths, and so on. We restricted ourselves to these three conditions based on the availability of publicly available large-scale data. Caution should therefore be exercised while comparing the findings of this study with similar ones. Despite this limitation, this study is one of its kind where we have attempted to explore determinants of selected adverse neonatal outcomes using data from a large scale nationally representative sample survey. For analyzing the determinants, we have included information from recently delivered women having 174,947 live births to capture variables from diverse set of categories like medical and health seeking variables also. The findings underscore the growing concerns around selected adverse outcomes. Besides, it highlights an important parameter of birth preparedness and complication readiness, and several other community level factors that are rarely discussed in the context of adverse outcomes. Use of multilevel modeling also provides methodological level strengths. Some of the key limitations despite having various methodological and conceptual strengths relate to the variable selection and development of composite index. We planned to include stillbirth and miscarriages also in our study, however due to data limitations we could not do that. Nutritional level variables were also not analyzed in this study.
Conclusion and Recommendation
The study underscores that specific adverse neonatal outcomes in India has shown an increase, prompting significant concern. Factors such as low literacy rates, belonging to poor wealth, lack of preparedness for childbirth or complications, and having no intentions regarding the current pregnancy have been implicated as contributory factors. There is need to institute a mechanism for generating knowledge amongst women to protect them from unwanted pregnancies and later adverse outcomes.
Data availability
The data used for this study has been downloaded from DHS data program portal after the prior registration and permission. There are no identifiers in the data which is available in the public domain thus has no ethical implication.
Abbreviations
- ANO:
-
Adverse neonatal Outcome
- DHS:
-
Demographic and Health Survey
- NFHS:
-
National Family Health Survey
- LBW:
-
Low birth weight.
- IFA:
-
Iron folic acid supplementation
- PTB:
-
Preterm birth
- BPCR:
-
Birth preparedness and complication readiness
- HRFB:
-
High risk fertility behavior
- ANC:
-
Antenatal Checkup
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The authors confirm contribution to the paper as follows: study conception and design: AKP, BTM, SBN; data collection: AKP, BTM; Literature review: AKP, DG; analysis and interpretation of results: AKP, BTM, AB; draft manuscript preparation: AKP, DG, BTM. All authors (AKP, BTM, DG, AB, DAW, SS, SBN) reviewed the results and approved the final version of the manuscript.
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Pandey, A.K., Thomas, B.M., Gautam, D. et al. Unraveling the complexity of selected adverse neonatal outcomes in India: a multilevel analysis using data from a nationally representative sample survey. BMC Pregnancy Childbirth 25, 377 (2025). https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s12884-025-07448-9
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DOI: https://doiorg.publicaciones.saludcastillayleon.es/10.1186/s12884-025-07448-9