Evidence map›Paper›PMID 41414845›Full record

SynthesisAnnals of medicine2025

Global prevalences of erythropoiesis-associated micronutrient deficiencies (iron, folate, and vitamin B

Nhi Thi Hong Nguyen, Yang-Ching Chen, Nguyen Thanh Nhu, Hoang Bui Bao, Chien-Yeh Hsu, Arpita Das, Jane C-J Chao

Abstract readSystematic ReviewMeta-Analysis
In one paragraph

Synthesis in Annals of medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.

0numbers the graph read from it
0cells of the map it votes in
3citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

3 citing papers in PubMed.

  1. Article
  2. Article
  3. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Nhi Thi Hong NguyenSchool of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan.ORCID 0000-0001-7195-6171
Yang-Ching ChenSchool of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan.ORCID 0000-0002-0682-3716
Nguyen Thanh NhuFaculty of Medicine, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam.ORCID 0000-0002-1636-6061
Hoang Bui BaoHealth Personnel Training Institute, University of Medicine and Pharmacy, Hue University, Hue, Vietnam.ORCID 0000-0003-4066-7312
Chien-Yeh HsuDepartment of Information Management, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan.ORCID 0000-0001-8233-6461
Arpita DasSchool of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan.ORCID 0000-0001-7043-3328
Jane C-J ChaoSchool of Nutrition and Health Sciences, Taipei Medical University, Taipei, Taiwan.ORCID 0000-0002-3610-9580

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundDeficiencies of iron, folate, and vitamin B12 micronutrients are considered a global public health issue. These deficiencies not only lead to anemia but are also linked to numerous short- and long-term health risks for both mothers and children. This study aimed to estimate the global prevalence of erythropoiesis-associated micronutrient deficiencies (iron, folate, and vitamin B12) in pregnant women. MATERIALS AND

methodsWe systematically searched three databases, including PubMed, Embase, and Scopus, along with a manual search for observational studies published up to August 26, 2024. Data extraction was independently screened by two reviewers. Random-effects models were employed to pool data on prevalences of iron, folate, and vitamin B12 deficiencies among pregnant women. We identified 43 studies from 28 countries.

resultsGlobal pooled prevalences of single iron, folate, and vitamin B12 deficiencies were 28.4% (95% CI, 21.1-37%), 11.1% (95% CI, 3.9-27.5%), and 17.1% (95% CI, 8.8-30.6%), respectively. Pooled prevalences of double micronutrient deficiencies of iron or folate were 53.1% (95% CI, 49.8-56.5%) and 49.6% (95% CI, 46.2-53%), respectively; double micronutrient deficiencies of folate or vitamin B12 were 6.2% (95% CI, 1.2-25.8%) and 11.8% (95% CI, 3.3-34.1%), respectively. Pooled prevalences of triple micronutrient deficiencies of iron or folate or vitamin B12 were 36.1% (95% CI, 13.1-68%), 34.3% (95% CI, 16.9-57.3%), and 12.6% (95% CI, 7-74.8%), respectively.

conclusionThe findings highlight the high prevalences of erythropoiesis-related micronutrient deficiencies in pregnant women worldwide. Targeted interventions to mitigate these deficiencies during pregnancy.

Indexed as

Anemia, Iron-DeficiencyErythropoiesisFolic Acid DeficiencyIron DeficienciesMicronutrientsVitamin B 12 DeficiencyFemaleFolic AcidGlobal HealthHumansIronPregnancyPrevalenceVitamin B 12Folic AcidIronMicronutrientsVitamin B 12folate deficiencyIron deficiencymeta-analysispregnant womenvitamin B12 deficiencyworldwide prevalence

Identifiers

PMID41414845
PMCPMC12720681

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.