Machine Learning for Neonatal Survival Prediction: A Systematic Review and Meta-analysis with Implications for Subphenotype-Based Modeling

Authors:
  • Restu Octasila , Faculty of Public Health, Universitas Indonesia, Jawa Barat, Indonesia,
  • Besral , Department of Biostatistic and Population, Universitas Indonesia, Jawa Barat, Indonesia
  • Puji Laksmini , Faculty of Public Health, Universitas Indonesia, Jawa Barat, Indonesia.
  • Siti Dariyani , Faculty of Public Health, Universitas Indonesia, Jawa Barat, Indonesia.
  • Darin Zahra , D3 Midwifery Study Program, Banten High School Of Health Sciences, Banten, Indonesia.

Article Information:

Published:April 30, 2026
Article Type:Original Research
Pages:3011 - 3020
Received:April 9, 2026
Accepted:April 21, 2026

Abstract:

Introduction: Machine learning algorithms have shown promise in predicting the survival among neonates. Yet, current models are predominantly trained on heterogeneous populations and lack any clinically relevant subgroup discovery. The combined use of unsupervised clustering and predictive modelling  could enhance prognostic accuracy and clinical utility. Methods: A systematic review and meta-analysis following PRISMA 2020 guidelines was performed, and it is registered in PROSPERO (CRD420261279521). A scoping review was conducted searching PubMed,  Scopus, and EMBASE for articles from 2015 to 2025 on machine learning systems predicting infant survival. Rob's risk of bias was evaluated with probast. The AUROC values in the studies were  assessed, and a meta-analysis using random effects was performed. Results:  Twelve of the eligible studies met the inclusion criteria, and nine were pooled in the meta-analysis. AUROC values were reported between 0.811 and 0.952, suggesting overall strong discrimination performance with diverse algorithms such as logistic regression, random forests, neural networks, and ensemble models. Multimodal predictors integrating perinatal features,  biomarkers, electronic health records information, and physiological measurements were able to maintain the predictive performance. Nevertheless, many studies constructed homogeneous population-based models without specific subphenotype characterization. The rating of risk of bias showed some concerns, especially about the external validation and risk of overfitting. Conclusions: Machine learning models are highly discriminative for neonatal survival prediction, but methodological limitations and population heterogeneity constitute major challenges. Integrating clustering within a predictive  framework might either achieve better precision, interpretability, or translational utility. An empirical testing of subphenotype-based modeling approaches should be a high priority for future work.

Keywords:

Neonatal Mortality; Infant Survival; Machine Learning; Cluster Analysis Prognosis.

Article :

INTRODUCTION:

Congenital melanocytic nevi (CMN) are pigmented cutaneous lesions present at birth, resulting from the proliferation of neural-crest–derived melanocytes within the skin. Their clinical appearance ranges from small, well-circumscribed macules to large, geographically extensive plaques(1). The size-based classification is clinically significant, with giant congenital melanocytic nevi (GCMN) typically defined as lesions measuring more than 20 cm in projected adult size or covering more than 2% of the body surface area in newborns representing the most severe end of the spectrum. GCMN carries both cosmetic and psychosocial consequences for families, as well as important medical considerations, including risk of melanoma, neurocutaneous melanosis, and associated structural anomalies(2).

 The bathing-trunk or garment-type distribution of GCMN, which involves the lower trunk, gluteal region, and lower limbs, is one of the more dramatic presentations. These lesions often coexist with multiple satellite nevi and may be associated with leptomeningeal melanocytosis(3). Nevertheless, the majority of affected neonates remain neurologically asymptomatic at birth. While the dermatological manifestations of GCMN are well known, the coexistence of additional congenital soft-tissue masses or vascular malformations is uncommon and less frequently reported in literature(4).

 Vascular anomalies in neonates encompass a wide heterogeneity of lesions, ranging from high-flow arteriovenous malformations to benign low-flow venous or lymphatic malformations. Their clinical presentation varies widely depending on anatomical site, flow characteristics, and depth of involvement(5). Low-flow vascular malformations tend to be soft, compressible, and slow-growing, whereas solid, firm, progressively enlarging pedunculated masses at birth are unusual and may mimic lipomas, neurofibromas, hamartomas, teratomas, or fibrous tumors. When such masses coexist with GCMN, the diagnostic complexity increases, particularly in distinguishing between melanocytic proliferation and unrelated soft-tissue tumors(6).

 Antenatal ultrasonography has significantly improved prenatal detection of structural fetal anomalies. However, small or superficially located cutaneous lesions particularly vascular malformations confined to the subcutaneous plane may remain undetected due to fetal position, limited contrast resolution, and technical constraints(7). Thus, even in pregnancies with normal mid-trimester anomaly scans, neonates may present with unexpected external masses at birth. Early postnatal imaging, including ultrasound with Doppler and MRI, plays a crucial role in delineating lesion extent, flow characteristics, tissue components, and relationship with underlying structures(8).

 The simultaneous occurrence of a giant bathing-trunk nevus with a large pedunculated low-flow vascular mass is extremely rare and sparsely documented. Such presentations pose diagnostic, therapeutic, and psychosocial challenges for clinicians and caregivers. Surgical intervention becomes necessary when complications such as rapid enlargement, tension on overlying skin, ulceration, or cosmetic concerns arise(9). This case highlights the importance of meticulous clinical evaluation, detailed imaging, and coordinated multidisciplinary management in neonates presenting with complex congenital cutaneous and soft-tissue lesions.

METHODS:

This research was conducted in compliance with the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) 2020 statement. This systematic review protocol is registered in PROSPERO (registration number:  CRD42026127 9521). Some small amendments were made to the title of this document - no changes were made to the overall focus or content of this piece of research. By doing so, this review paper will first review and critically assess the existing scientific literature regarding the use of machine learning (ML) techniques for predicting infant survival/death, followed by evaluating the possibility of combining clustering–based analytical strategies with machine learning prediction models, thereby  enhancing neonatal prognostic modeling. We conducted a systematic literature search using three databases (PubMed, Scopus, and EMBASE) to identify articles between January 1, 2015, and  December 31, 2025, with English language restriction. The search strategy was constructed and included thesauri/controlled vocabulary (MeSH and Emtree) as well as free terms used focusing on newborn outcomes, infant survival/mortality–explicitly defined as “infant mortality”, “neonatal mortality” or “infant survival” -and any AKA related approaches: machine leaning techniques (“machine learning,” “artificial intelligence", "deep learning", "neural network", "random forest”) in line of risk strata fication such as clustering(“clustering”), unsupervised-learningor subphenotype – term alternative use for ("subphenotype").

The search from the databases provided a total of 2,596 articles (PubMed = 1,103; Scopus = 1,203, and EMBASE = 291). 2,494 articles were screened following removal of duplicates and exclusion of administrative records. Title and abstract were screened by two independent reviewers to search for predictions of IM/S COMLS using machine learning. Overall, 2,338 articles were excluded due to non-generalizability or ML approach, and 36 otherwise; not meeting language and outcome definitions. Complete texts of 120 articles were then read to assess  eligibility. A total of 108 articles were excluded for reasons including inadequate sample size, no follow-up studies, or inappropriate design (Figure 1). Ultimately, twelve studies fulfilled all the criteria for inclusion and were included in the qualitative synthesis. Out of 12 studies,  the AUROC values were 9 for quantitative discrimination, or had enough data and could be included in the meta-analysis. The PRISMA 2020 flow diagram describes the study selection procedure (Fig. 1).

We included studies reporting quantitative performance measures (AUROC or AUC) on machine learning methods/models for survival/mortality prediction in infants published between 2015 and 2025, that were written in English. Editorial, comments, or news narrative reviews for discussion of background information, brief reports that did not clearly state the methodology, and were not applied ML approach, those studies had been excluded from our review. Data were extracted to a standardised form, which included the type of study, characteristics of the research population (size and description), number of predictor variables studied , types of machine learning algorithms used, validation methods used, and model performance outcomes. The process of full text extraction was performed independently by two reviewers, and consensus was reached for any disagreements. PROBAST (Prediction model Risk Of Bias Assessment Tool) was used for Quality Appraisal of the participants and predictors, outcome, and analysis domains. We both used narrative synthesis to summarise patterns of population heterogeneity and methodological variation, and quantitative synthesis of AUROCs from the nine studies that reported them to obtain an overall quantitative summary estimate of discriminative performance of machine learning models in predicting survival amongst neonates. Overall, the generalisation of our meta-analysis should be considered exploratory rather than confirmatory due to a number of the included studies being non-informative for full variance. A random-effects model was used to allow for anticipated clinical and methodological diversity between studies.


 

Records Identified From*:

Pubmed 1102

Scopus 1203

Embase 291

Registers (N = 0)

Identification

Screening

 

Identification of studies via databases and registers

 

 

Records removed before screening:

Duplicate records removed  (n = 102)

Records marked as ineligible by automation tools (n = 0 )

Records removed for other reasons (n = 1)


 

Studies included in the review

(n = 12)

Reports included in the meta-analysis

(n = 9)

Records screened

(n = 2494)

Records excluded**

Out of scope (n=2338)

not in English (35)

Different outcome (1)

Reports sought for retrieval.

(n = 126)

Reports not retrieved

(n = 6)

Reports assessed for eligibility.

(n = 120)

Reports excluded: 108

Included

 

 

 

 

 

 

 

 

 

 

 Figure 1. PRISMA 2020 flow diagram

 

RESULTS:

The review identified 12 studies meeting the inclusion criteria, all of which were eligible for qualitative synthesis and had eciprocal reproduction data available in [9]. Discrimination performance of the machine learning models was consistently good to excellent across studies, with reported AUROC values from 0.81 to 0.97. [5–8,20,21]. However, all of these methods are relatively generic , and none have tried to bring together unsupervised clustering-based sub-phenotype identification.

 

Oh et al. were  the two biomarker-based studies. [5] showed that lactate levels within the first 12 hours of life were a significant contributor to the tree-based models (AUC 0.811), indicating a high-risk metabolic phenotype existed in their population. These findings are also consistent with the literature on the added value of biomarkers to clinical prediction models [22].

 

Yang et al. [7] and Podda et al. [14], when comparing to only simpler perinatal factors (which included gestational age and birth weight) as dominant classifiers (NB GEOCS24, 25; AUC up to 0.90). Teh et al. vs Longitudinal method of Na et al. [21] (AUROC 0.932–0.973) and the phase adaptive approach proposed in [17] achieved comparable performance to Methods, but to our knowledge are not directly comparable. [6](td-AUC=0.838)  indirectly supports the heterogeneity temporality in neonates.

 

1The EHR-based research work by Li et al. [8](AUROC 0.91) illustrates the advantage of using maternal and neonatal data together to detect differences in risk not captured by traditional models. Brahma & Mukherjee [13] expose another factor, which are the social determinants of 6 Pop World JOURNAL. Therefore, they also have a link with infantile mortality (in a context of poverty). Their study provides an integrated view , not merely at the biological but also at the structural level of any heterogeneity. Do et al. compared various algorithms. [20]. Overall, while our focus is not on clustering, the empirical risk of biomarkers, phase of disease, or social determinants and natural history process all support this requirement for population segmentation prior to predictive model development [5–8,13–15,20,21]. A summary of the most relevant results is reported in the table below.

 

Table 1. Characteristics of Included Studies

No

Author (Year)

Country/Data Source

Study Design

Population (n)

Outcome

ML

Method(s)

Best

Performance

1

Oh et al.

(2025)

Korea, single NICU

Retrospective cohort

168 very low

birth              weight

infants

D7 & D30 mortality

RF, GBM, LightGBM

AUC             0.811

(GBM)

2

Smith    et

al. (2024)

USA/Canada PHN

Multicenter cohort

549        HLHS

infants

5-year transplant-free survival

ML

ensemble + SHAP

td-AUC

0.838

3

Yang et al.

(2024)

Taiwan Neonatal Network

Nationwide cohort

7,471 VLBW infants

Early mortality

LR, NN

AUC 0.81– 0.90

4

Li           et              al.

(2024)

USA, MIMIC-III

Retrospective database

459 infants (37 deaths)

NICU survival

Random Forest

AUROC

0.91

5

Na et al.

(2023)

Korean Neonatal Network

Nationwide cohort

15,790   very

low        birth

weight infants

In- hospital mortality

MLP      +

ensemble

AUROC

0.932–0.973

6

Mfateneza

et           al.

(2022)

Rwanda

DHS

Cross-sectional

8,000+ records

Infant mortality

RF, SVM, DT

AUROC 0.842 (RF)

7

Leigh     et

al. (2022)

USA

Retrospective cohort

689            preterm

infants

BPD-free survival

Ensemble ML

AUROC

0.921 / 0.899

8

Do         et al.

(2022)

Korean Neonatal Network

Nationwide cohort

7,472 very low

birth              weight

infants

Mortality

LR, ANN, RF, SVM

AUROC

0.845

(ANN)

9

Brahma & Mukherjee

(2022)

India DHS

National survey

100,000+

births

Neonatal

&           infant

mortality

LASSO, RF,

Boosting

AUPRC              >

LR

10

Rinta-

Koski    et

al. (2018)

Finland

NICU

Cohort

598 very low

birth              weight

infants

In- hospital mortality

Gaussian Process

AUC 0.948

11

Podda   et

al. (2018)

Italian Neonatal Network

Multicenter cohort

23,747

(development), 5,810 (test)

Survival prediction

Neural Network

AUROC

0.914

12

Chen et al.

(2017)

Canada

Retrospective

48 infants

3-month survival

CART

Accuracy 83

 

Quality assessment was performed using the PROBAST tool across 4 domains (participants, predictors, outcome, analysis). Many studies were at low risk of bias in the areas of participant, predictor, and outcome domains, indicating appropriate targeting of population, definition of predictors, and specification of outcomes. But the fears were mostly an analytic worry. Five studies were rated to have an overall high risk of bias, mainly due to inadequate external validation or overfitting, and a lack of information on calibration and the binary outcome data. Several of the studies were classified to have unclear risk as a result of incomplete reporting on methodological details regarding model validation and hyperparameter tuning. Validation: Only  two studies received a low risk of bias rating overall (robust validation, clear reporting). Risk of Bias for the included studies is shown in the table.

 

Table 2. Risk of Bias Assessment Using PROBAST

No

Study

Participants

Predictors

Outcome

Analysis

Overall Risk

1

Oh et al. (2025)

Low

Low

Low

High

High

2

Smith et al. (2024)

Low

Low

Low

Unclear

Unclear

3

Yang et al. (2024)

Low

Low

Low

Unclear

Unclear

4

Li et al. (2024)

Low

Low

Low

High

High

5

Na et al. (2023)

Low

Low

Low

Low

Low

6

Mfateneza et al. (2022)

Unclear

Low

Low

High

High

7

Leigh et al. (2022)

Low

Low

Low

Unclear

Unclear

8

Do et al. (2022)

Low

Low

Low

Low

Low

9

Brahma & Mukherjee (2022)

Unclear

Low

Low

High

High

10

Rinta-Koski et al. (2018)

Low

Low

Low

Unclear

Unclear

11

Podda et al. (2018)

Low

Low

Low

Unclear

Unclear

12

Chen et al. (2017)

Unclear

Low

Low

High

High

 

Prediction accuracy of infant survival by machine learning models is good or near perfect because the pooled AUROC scores are high, as reported in the current meta-analysis. Across AUROCs for individual outcomes (0.811–0.952), a range of algorithmic approaches (e.g., logistic regression to ensemble neural networks) may be capable of excellent discrimination in the newborn population. However, high heterogeneity in sample size of the studies and differences in study design and population do not permit generaliz ation on this good diagnostic performance.

 

There was no obvious asymmetry in the funnel plot, indicating that there is no strong evidence of publication bias caused by small-study effects. However, the interpretation should be cautious as few studies and significant methodological heterogeneity existed. Interpretation of causality regarding asymmetrical distribution patterns. With regard to models intended for prediction, differences in outcome definitions may be present, as well as the duration between baseline and follow-up (frequency imbalance) or a non-random selection of predictors to enter into the model

 

Table 3. Meta-analysis Dataset with Statistical Transformation

Study

 

Sample Size (n)

AUROC

logit

(AUROC)

Approx. SE(AUROC)

Variance (SE2)

Oh et al. (2025)

 

168

0.811

1.4565

0.03021

0.0009124

Smith    et al. (2024)

 

549

0.838

1.6434

0.01573

0.0002473

Yang et al.(2024)

 

7471

0.855

1.7744

0.00407

0.0000166

Li           et              al. (2024)

 

459

0.910

2.3136

0.01336

0.0001784

Na et al. (2023)

 

15,790

0.952

2.9874

0.00170

0.0000029

Mfateneza et              al. (2022)

 

8000

0.842

1.6732

0.00408

0.0000166

Leigh     et al. (2022)

 

689

0.910

2.3136

0.01090

0.0001189

Do et al. (2022)

 

7472

0.845

1.6959

0.00419

0.0000175

Rinta-Koski et al. (2018)

 

598

0.948

2.9031

0.00908

0.0000824

Podda   et al. (2018)

 

23747

0.914

2.3635

0.00182

0.0000033

The MID (moderate) AUROCs of the meta-analysis give evidence to conclude that performance on the prediction of survival in newborns using machine learning models is acceptable and mostly good to very good. The broad variation of individual AUROCs (0.811–0.952), I believe, is an illustration that there are algorithm designs ranging from logistic regression to ensemble neural networks, that could have very good classification performance in this population of newborns. However, the very heterogeneous sample size between studies and study designs makes the perfect performance not interpretable in general.


Fig 2. AUROC diagram

 Studies with a larger sample size from national networks that demonstrate consistently better performance (ie, stable point estimates and small SEs) will be given more weight in random effects models. In contrast, estimates from small samples are more variable and have broader confidence intervals , indicating that performance estimates could be unstable. This observation is consistent with a statistical theory that discrimination estimates are plagued by the work of overfitting for small sample sizes, and in particular when the number of predictors is not large compared to the number of events.

 This can be argued from the perspective of risk bias PROBAST. Prospective studies show most studies to be low risk in participant and outcome, methodological weaknesses are more frequently identified in the analysis domain. Some research lacks a model calibration, external validation , or a more in-depth explanation of how they addressed the missing data and class imbalance. This is important, as high discrimination (AUROC) does not necessarily imply good generalization to external populations. Hence, although the pool AUROC suggests encouraging performance, performance overestimation is not completely ruled out.

 No evidence of obvious asymmetry was detected in funnel plot analysis, revealing that there is no strong publication bias of small-study effects. However, we ought to be careful to interpret the effect as the number of included studies was small and there appeared to be considerable methodological diversity. In the context of prediction models, variation in outcome definitions, follow-up time, choice of predictors, and validation approach can lead to asymmetrical distributions despite the absence of evidence for systematic publication bias.

 

DISCUSSION :

This systematic review and metaanalysis highlights that ML models consistently achieve a high level of discrimination for neonatal survival prediction in a variety of datasets and clinical environments. Nevertheless, the evidence also indicates significant heterogeneity in predictor choice, statistical modeling, and validation approaches. Most importantly, the majority of published models  have been trained using population-based methods without direct recognition of clinically relevant subphenotypes, which could indicate that high predictive accuracy itself may not capture completely model stability or transportability in diverse neonatal populations.

 High-performance discrimination in neonatal prediction models is in line with publications from clinical machine learning , generally, where ensemble models, neural networks, and tree-based methods were shown to have a high predictive accuracy in datasets related to healthcare [1–4]. Many of the studies in this review also revealed that core perinatal factors , such as gestational age, birth weight, and APGAR score, remained crucial predictors, only for alimited time to come [5,7,14,22]. Biomarker model of risk, including the role of early-life lactate levels, has also been reported to improve mortality prediction in preterm infants [5]. The inclusion of maternal features along with electronic health records (EHRs) and long-term physiologic data illustrates the rising prevalence of multimodal prediction modeling in clinical medicine [2,8].

 Answering the Research Questions

The current review aimed to answer three pre-defined research questions on population heterogeneity, model specialization, and the predictive determinants of neonatal survival modelling.

 RQ1: Are clinically relevant subgroups of neonates inducible by an unsupervised clustering approach?

The results of this review have uncovered significant biological, clinical, temporal, and social variation among neonatal populations in terms of metabolic biomarkers, treatment-phase dynamics, physiological monitoring signals, and structural determinants of health [5,6,13,21]. Although clustering-based modeling workflows were seldom directly applied in the neonatal studies investigated, robust evidence from other medical disciplines suggests that unsupervised clustering can effectively be used to identify clinically relevant subphenotypes associated with differential outcomes and treatment responses [9,10,16]. Collectively, available evidence supports the conceptual soundness and potential clinical relevance of clustering-based subphenotype identification for use as a preparatory step in neonatal prognostic model-building.

 

RQ2: Are subphenotype-specific prediction models superior to generic population-wide models?

The included literature lacked any direct comparison between clustering-based subphenotype models and general neonatal prediction models. Collecting indirect evidence, however, suggests that predictive models built  in more homogenous clinical cohorts (e.g., disease-specific populations or longitudinal phase-stratified cohorts) have better stability and discrimination properties [6,21]. On the other hand, models that were trained on more diverse neonatal cohorts combined across sites during these trials may demonstrate good discrimination within yet have relatively high risk for overfitting and inferior external generalizability [18,19]. These data imply that population stratification and subphenotype-specific modeling could enhance predictive performance, while prospective confirmatory studies testing these approaches are yet to be conducted.

RQ3: What are the most important predictors, algorithms, and modeling attributes for neonatal survival prediction?

 Gestational  age, birth weight, Apgar scores (at 5 min), metabolic biomarkers such as lactate, maternal clinical factors, and physiological data from the electronic health record were among the most commonly important predictors across studies [5,7,8,14,22]. There was an indication in population-based data that a similar risk associated with mortality could be caused by factors related to socioeconomic status [13]. With respect to modeling methodologies, several ensemble tree-based models, neural networks, and mixed types of machine learning architectures often achieved excellent predictive performance [5,8,21]. However, more parsimonious models like logistic regression sometimes can perform comparably in structured or fairly homogeneous populations [7,20]. Model interpretability tools and techniques, such as SHAP-based explanations, were highlighted as crucial for improving clinical transparency and promoting responsible use of machine learning prediction systems [11].

 Together, these results suggest that the 98 For IUPS ( https://www.iups.org/ ) meeting Abstracts evidence base for prediction of neonatal survival will be best served by wellperforming core clinical predictors in conjunction with contextually appropriate algorithm choice and modeling frameworks amenable to population heterogeneity.

 Recommendations for Future Research

Further work is required to validate external generalization of the clustering-then-predict framework on larger sample , multicenter datasets via empirical validation. Validation across population and healthcare environments will be necessary to determine the stability of the generated spp and regulation performance consistency. More robust methods should also be applied to handle the imbalanced class and missing data in future studies, as neonatal mortality is a relatively rare event and clinical information is usually incompletely collected. Methods, such as over-sampling followed by under-sampling, cost-sensitive or probabilistic learning, might be applied in order to improve the predictive capability.

 In addition, interpretability should be designed carefully from the beginning rather than being an afterthought at the end of analysis. The utilization of tools such as SHAP or other explainable AI modalities is expected to improve clinician confidence around, and integration of predictive model output into clinical practice and health policy. Prototyping of real-time decision support systems leveraging physiologic data is another field that is growing, especially to identify early deterioration and for resource utilization in the NICU. Nevertheless, the  rollout of such systems needs to be evaluated prospectively, and the impact on clinical endpoints (mortality, morbidity) as well as service delivery needs to be tested. If this research agenda is pursued, it could render a historical focus on an integrative subphenotype-based approach more than just a conceptual model and thereby transform the construct into an implementable, adaptable, and clinically meaningful system of prognostication in neonatal medicine.

CONCLUSION :

The current review aimed to answer three pre-defined research questions on population heterogeneity, model specialization, and the predictive determinants of neonatal survival modelling.

RQ1: Are clinically relevant subgroups of neonates inducible by an unsupervised clustering approach?

The results of this review have uncovered significant biological, clinical, temporal, and social variation among neonatal populations in terms of metabolic biomarkers, treatment-phase dynamics, physiological monitoring signals, and structural determinants of health [5,6,13,21].

Although clustering-based modeling workflows were seldom directly applied in the neonatal studies investigated, robust evidence from other medical disciplines suggests that unsupervised clustering can effectively be used to identify clinically relevant subphenotypes associated with differential outcomes and treatment responses [9,10,16]. Collectively, available evidence supports the conceptual soundness and potential clinical relevance of clustering-based subphenotype identification for use as a preparatory step in neonatal prognostic model-building.

RQ2: Are subphenotype-specific prediction models superior to generic population-wide models?

The included literature lacked any direct comparison between clustering-based subphenotype models and general neonatal prediction models. Collecting indirect evidence, however, suggests that predictive models built  in more homogenous clinical cohorts (e.g., disease-specific populations or longitudinal phase-stratified cohorts) have better stability and discrimination properties [6,21]. On the other hand, models that were trained on more diverse neonatal cohorts combined across sites during these trials may demonstrate good discrimination within yet have relatively high risk for overfitting and inferior external generalizability [18,19]. These data imply that population stratification and subphenotype-specific modeling could enhance predictive performance, while prospective confirmatory studies testing these approaches are yet to be conducted.

RQ3: What are the most important predictors, algorithms, and modeling attributes for neonatal survival prediction?

Gestational  age, birth weight, Apgar scores (at 5 min), metabolic biomarkers such as lactate, maternal clinical factors, and physiological data from the electronic health record were among the most commonly important predictors across studies [5,7,8,14,22]. There was an indication in population-based data that a similar risk associated with mortality could be caused by factors related to socioeconomic status [13]. With respect to modeling methodologies, several ensemble tree-based models, neural networks, and mixed types of machine learning architectures often achieved excellent predictive performance [5,8,21]. However, more parsimonious models like logistic regression sometimes can perform comparably in structured or fairly homogeneous populations [7,20]. Model interpretability tools and techniques, such as SHAP-based explanations, were highlighted as crucial for improving clinical transparency and promoting responsible use of machine learning prediction systems [11].

Together, these results suggest that the 98 For IUPS ( https://www.iups.org/ ) meeting Abstracts evidence base for prediction of neonatal survival will be best served by wellperforming core clinical predictors in conjunction with contextually appropriate algorithm choice and modeling frameworks amenable to population heterogeneity.

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