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Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies
Open accessAbstract
Background: Maternal and perinatal mortality remain critical indicators of global health inequity. In 2020, an estimated 287 000 women died from preventable causes related to pregnancy, and in 2021, approximately 2.3 million neonatal deaths occurred within the first 28 days of life. A recently defined risk group, small vulnerable newborns (SVNs, including preterm, low birth weight, and small‐for‐gestational‐age infants), highlights the compounded vulnerability of certain newborns. Maternal education is a key social determinant of health, yet its effect on maternal and perinatal outcomes across global settings remains insufficiently quantified. Aims: The primary aim of this study was to quantify the association between maternal education level and adverse maternal and perinatal outcomes. The secondary aim was to evaluate whether these associations vary by country income level. Methods: We conducted an individual participant data (IPD) meta‐analysis using data from the International Prediction of Pregnancy Complications (IPPIC) Network. Eligible studies included those reporting maternal and perinatal outcomes stratified by at least two levels of maternal education (informal/primary, secondary, tertiary). Primary outcomes were maternal mortality, preeclampsia, stillbirth, and SVNs. Associations were estimated using a two‐step random‐effects IPD meta‐analysis adjusted for maternal age and ethnicity. Odds ratios (ORs) and 95% confidence intervals (CIs) were reported. Results: Compared to tertiary education, women with secondary education had a 27% higher risk of maternal death (OR 1.27, 95% CI 0.38; 4.30), and those with informal or primary education had approximately double the risk (OR 2.51, 95% CI 0.23; 26.95). Risk of stillbirth was also twofold higher in lower education groups. These association remained significant in analyses restricted to high‐income countries. Discussion: Women with lower levels of education are at substantially greater risk of adverse maternal and perinatal outcomes. These findings reinforce the need for education‐focused policy and health system strategies to reduce maternal and neonatal mortality, particularly in settings with high educational inequality.
Overview
CoChat Summary
TL;DR
In an IPD meta-analysis of 2,356,402 singleton pregnancies from 23 IPPIC cohorts, lower maternal education was associated with higher risks of stillbirth and small vulnerable newborns, but not preeclampsia or maternal death. The stillbirth association persisted in high-income countries, while the SVN association did not.
Key findings
- Maternal death: compared with tertiary education, secondary education had RR 1.27 (95% CI 0.38–4.30) and informal/primary education had RR 2.51 (95% CI 0.23–26.95); neither was statistically significant.
- Stillbirth: secondary education had RR 1.25 (95% CI 1.09–1.43) and informal/primary education had RR 2.03 (95% CI 1.27–3.24), compared with tertiary education.
- Small vulnerable newborn: secondary education had RR 1.12 (95% CI 1.03–1.22) and informal/primary education had RR 1.20 (95% CI 1.01–1.44).
- Preeclampsia: no statistically significant differences; Table 1 reports RR 1.05 (95% CI 0.97–1.15) for secondary and RR 1.12 (95% CI 0.89–1.41) for informal/primary education.
Methods
- Two-step random-effects individual participant data meta-analysis using the International Prediction of Pregnancy Complications (IPPIC) Network; 23 cohorts, 2,356,402 women with singleton pregnancies.
- Maternal education harmonized as informal/primary (≤6 years), secondary (7–12 years), and tertiary (>12 years), with tertiary as reference; models adjusted for maternal age and ethnicity.
- Multiple imputation with 10 datasets for missing data; within-cohort generalized linear models with log link, pooled using DerSimonian–Laird random-effects and Hartung–Knapp standard errors; reported risk ratios with 95% CIs, I², and τ².
Limitations
- The paper states: analysis was confined to IPPIC cohorts with shared IPD, potentially introducing exclusion bias; some cohorts had high missing data; temporal changes and varying stillbirth definitions may affect estimates; unmeasured confounding remains possible; risk-of-bias assessment was performed by a single reviewer.
- Evident from the text: maternal death estimates are very imprecise because of low event frequency; the text and Table 1 disagree on the secondary-education preeclampsia RR (text reports 1.25 [1.09–1.43], table reports 1.05 [0.97–1.15]).
Model-written summary. Check it against the paper before relying on it.
Integrity signals
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Verification
Claims the paper makes
0 Valid · 0 Not valid · 20 Not checked · 66 Own results and interpretations
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“For stillbirth, we found a dose–response relationship between educational level and the risk of stillbirth, with a twofold increased risk of stillbirth for women with lower levels of education and a 25% increased risk in women with secondary education; that is also the case when our analysis is limited to high‐income countries.”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > DISCUSSION
plainstates an association- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Maternal death | Secondary school | 4 | 454 | 389 001 | 96 | 109 700 | 1.27 (0.38; 4.30) | 0.575 | 63.8 | 0.19”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our data shows that women with lower education have a significantly higher risk of having an SVN, especially those from low‐ and middle‐income countries.”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > DISCUSSION
plainstates an association- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Pre‐eclampsia | Secondary school | 23 | 33 547 | 1 204 074 | 22 902 | 785 857 | 1.05 (0.97; 1.15) | 0.228 | 83.5 | 0.02”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
plain- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: unclear — It is unclear whether the paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Stillbirth | Secondary school | 19 | 7390 | 442 288 | 2092 | 196 837 | 1.25 (1·09; 1.43) | 0.003 | 54.1 | 0.03”
- Also stated in: § Perinatal outcomes · plain
“We found a 25% increased risk of stillbirth for women with secondary education compared with women with tertiary studies (RR 1.25 CI [1.09; 1.43])”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
plainstates an association- Asserted: passes — The authors put it forward as true.
- Checkable: passes — It can be checked against evidence.
- Load-bearing: passes — The paper’s conclusions depend on it.
- Based: passes — The paper gives a reason why it holds.
- Also stated in: § Perinatal outcomes · plain
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Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Rated major: it would touch a result — a value a result rests on, reported and recomputed p-values on opposite sides of the significance level, two passages that conflict with no sign which is right, or a cited work retracted before this paper was published.
In the paper
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > Abstract > Results
“These association remained significant in analyses restricted to high‐income countries.”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Perinatal outcomes
“Confirming the association between maternal education and maternal death was not possible because of the number of studies excluded, and the results for preeclampsia and maternal education were consistent with our previous results. It is to be noted that while analyzed only for high‐income countries, the association between maternal education and SVN was not consistent with the previous results.”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
“We did not found differences for the risk of preeclampsia in women with informal or primary school (RR 1.12, 95% CI [0.86; 1.41]) or secondary school education (RR 1.25 CI [1.09; 1.43]) when comparing them with women with university schooling (Table 1).”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
“| Pre‐eclampsia | Secondary school | 23 | 33 547 | 1 204 074 | 22 902 | 785 857 | 1.05 (0.97; 1.15) | 0.228 | 83.5 | 0.02 |”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > Abstract > Results
“Risk of stillbirth was also twofold higher in lower education groups.”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Perinatal outcomes
“We found a 25% increased risk of stillbirth for women with secondary education compared with women with tertiary studies (RR 1.25 CI [1.09; 1.43]) and a twofold increase of risk of stillbirth (RR 2.03 CI [1.27; 3.24]) in women with informal or primary schooling”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS
“Seventeen studies reported data from high‐income countries, 13 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 one from a high–middle income country, 42 one from a middle‐income country, 47 one from a low‐income country, 43 and two studies reported data from multiple countries from different income levels. 44 , 45”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS
“The IPPIC IPD Network's database included 23 cohorts that reported maternal education level and at least one of the adverse maternal and or perinatal outcomes of interest.”
Rated minor: it would not touch a result — a value no result rests on, a p-value that stays on the same side of the significance level, or a conflict that is clerical, resolved elsewhere in the paper, or outside its own findings.
In the paper
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > Abstract > Results
“women with secondary education had a 27% higher risk of maternal death (OR 1.27, 95% CI 0.38; 4.30), and those with informal or primary education had approximately double the risk (OR 2.51, 95% CI 0.23; 26.95).”
§ Effects of maternal education on maternal and perinatal outcomes: An individual participant data meta‐analysis of 2 356 402 pregnancies > RESULTS > Maternal outcomes
“No statistically significant differences were found on the risk of maternal death from women with secondary school (RR 1.27, 95% CI [0.38; 4.30]) or informal or primary school education (RR 2.51, 95% CI [0.23; 26.95]) when comparing them with women with tertiary schooling.”
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Citations
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Metadata
- Authors
- Bello‐Álvarez, L., Fernández‐Félix, B. M., Allotey, J., Thangaratinam, S., & Zamora, J.
- Affiliations
- Escuela de Doctorado, Doctorado en Epidemiología y Salud Pública Universidad Autónoma de Madrid Madrid España
- Unidad de Bioestadística Clínica, Hospital Ramón y Cajal (IRYCIS), CIBERESP Madrid España
- WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research University of Birmingham Birmingham UK
- University of Liverpool (GB)
- Instituto Ramón y Cajal de Investigación Sanitaria (ES)
- ORCID
- Venue
- International Journal of Gynecology & Obstetrics
- Publisher
- Wiley
- Published
- 2025-07-28
- Volume
- 172
- Issue
- 2
- Pages
- 886-895
- ISSN
- 0020-6695 (ISSN-L)
- 0020-7292
- 1879-3479
- PMC
- PMC12790673
- OpenAlex
- W4412694805
- Cited by
- 20
- References
- 67
- Citations by year
- 2026: 17 · 2025: 3
- FWCI
- 3.46
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- International Journal of Gynecology & Obstetrics (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- University of Birmingham Research Portal (University of Birmingham) (publishedVersion, cc-by-nc-nd)
- Biblos-e Archivo (Universidad Autónoma de Madrid) (submittedVersion, public-domain)
- Funders
- Instituto de Salud Carlos III (PI24/1406, PI24/0416)
- Topics
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Global Maternal and Child Health
- Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Maternal and Neonatal Healthcare
- Health Sciences › Medicine › Obstetrics and Gynecology › Maternal and Perinatal Health Interventions
- Keywords
- maternal education, maternal mortality, perinatal outcomes, stillbirth, preeclampsia, low birth weight, preterm birth, social determinants of health, educational inequality, country income level, neonatal mortality
- MeSH terms
- Educational Status, Female, Humans, Infant, Newborn, Infant, Small for Gestational Age, Maternal Mortality, Pregnancy, Pregnancy Complications, Pregnancy Outcome, Global Health, Stillbirth, Perinatal Mortality
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