Evidence map›Paper›PMID 30347499›Full record

SynthesisBJOG : an international journal of obstetrics and gynaecology2019

Global inequities in dietary calcium intake during pregnancy: a systematic review and meta-analysis.

G Cormick, A P Betrán, I B Romero, C F Lombardo, A M Gülmezoglu, A Ciapponi, J M Belizán

Open access · hybridAbstract readMeta-AnalysisSystematic Review
PubMed Full text at PMC Publisher
In one paragraph

Synthesis in BJOG : an international journal of obstetrics and gynaecology, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers, 8 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
54citing papers in PubMed, 8 pooled it
5.8field-weighted citation impact, top 3% of its field
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

54 citing papers in PubMed, 8 syntheses or guidelines pooled it, 94 citations in OpenAlex.

  1. Pooled it
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  3. Calcium supplementation for people with overweight or obesity.The Cochrane database of systematic reviews · 2024
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  8. Global inequities in dietary calcium intake during pregnancy: a systematic review and meta-analysis.BJOG : an international journal of obstetrics and gynaecology · 2019
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  9. Trial
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  15. Article
  16. Observational
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  18. Dietary supplements and prevention of preeclampsia.Hypertension research : official journal of the Japanese Society of Hypertension · 2025
    Review
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  20. Review
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 3 countries.

G CormickDepartment of Mother and Child Health Research, Institute for Clinical Effectiveness and Health Policy (IECS-CONICET), Buenos Aires, Argentina.
A P BetránDepartment of Reproductive Health and Research, World Health Organization, HRP - UNDP, UNFPA, UNICEF, WHO, World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Geneva, Switzerland.
I B RomeroDepartamento de Salud, Universidad Nacional de la Matanza, San Justo, Argentina.
C F LombardoDepartamento de Salud, Universidad Nacional de la Matanza, San Justo, Argentina.
A M GülmezogluDepartment of Reproductive Health and Research, World Health Organization, HRP - UNDP, UNFPA, UNICEF, WHO, World Bank Special Programme of Research, Development and Research Training in Human Reproduction, Geneva, Switzerland.
A CiapponiDepartment of Mother and Child Health Research, Institute for Clinical Effectiveness and Health Policy (IECS-CONICET), Buenos Aires, Argentina.
J M BelizánDepartment of Mother and Child Health Research, Institute for Clinical Effectiveness and Health Policy (IECS-CONICET), Buenos Aires, Argentina.
Consejo Nacional de Investigaciones Científicas y Técnicas · ARUniversidad Nacional de La Matanza · ARWorld Health Organization · CH

Funding

Development and Research Training in Human Reproduction (HRP)UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of ResearchWorld Health Organization 001
6 · The paper itself

Abstract

backgroundEvidence shows that adequate calcium intake during pregnancy reduces the risk of hypertensive disorders of pregnancy. In most low- and middle-income countries (LMICs) the daily calcium intake is well below recommendations. Mapping calcium intake during pregnancy worldwide and identifying populations with low calcium intake will provide the evidence base for more targeted actions to improve calcium intake.

objectiveTo assess dietary calcium intake during pregnancy worldwide. SEARCH STRATEGY: MEDLINE and EMBASE (from July 2004 to November 2017). SELECTION CRITERIA: Cross-sectional, cohort, and intervention studies reporting calcium intake during pregnancy. DATA COLLECTION AND ANALYSIS: Five reviewers working in pairs independently performed screening, extraction, and quality assessment. We reported summary measures of calcium intake and calculated the weighted arithmetic mean for high-income countries (HICs) and LMICs independently, and for geographic regions, among studies reporting country of recruitment, mean intake, and total number of participants. When available, inadequate intakes were reported. MAIN

resultsFrom 1880 citations 105 works met the inclusion criteria, providing data for 73 958 women in 37 countries. The mean calcium intake was 948.3 mg/day (95% CI 872.1-1024.4 mg/day) for HICs and 647.6 mg/day (95% CI 568.7-726.5 mg/day) for LMICs. Calcium intakes below 800 mg/day were reported in five (29%) countries from HICs and in 14 (82%) countries from LMICs.

conclusionThese results are consistent with a lack of improvement in calcium dietary intake during pregnancy and confirm the gap between HICs and LMICs, with alarmingly low intakes recorded for pregnant women in LMICs. From the public health perspective, in the absence of specific local data, calcium supplementation of pregnant women in these countries should be universal. TWEETABLE ABSTRACT: Despite dietary recommendations, women in LMICs face pregnancy with diets low in calcium.

Indexed as

Health Status DisparitiesCalcium, DietaryDeveloping CountriesDietFemaleHumansHypertension, Pregnancy-InducedPregnancyRisk FactorsCalcium, DietaryCalciumdietaryhigh-income countrieshypertensionlow- and middle-income countriespre-eclampsiapregnancysystematic review

Identifiers

PMID30347499
PMCPMC6518872
OpenAlexW2896815942

What Socratic holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

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 Socratic graph.