ArticleJournal of caring sciences2015
The Effect of Vitamin D and Calcium plus Vitamin D during Pregnancy on Pregnancy and Birth Outcomes: a Randomized Controlled Trial.
Article in Journal of caring sciences, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 12 of them syntheses that pooled 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.
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.
Who cites it
18 citing papers in PubMed, 12 syntheses or guidelines pooled it.
- Impact of maternal micronutrient supplementation on pregnancy outcomes in developing countries: a systematic review and meta-analysis.BMC pregnancy and childbirth · 2026Pooled it
- Efficacy of vitamin D supplementation on the incidence of preeclampsia: a systematic review and meta-analysis.BMC pregnancy and childbirth · 2024Pooled it
- Calcium supplementation (other than for preventing or treating hypertension) for improving pregnancy and infant outcomes.The Cochrane database of systematic reviews · 2024Pooled it
- Vitamin D supplementation for women during pregnancy.The Cochrane database of systematic reviews · 2024Pooled it
- Maternal vitamin D and growth of under-five children: a systematic review and meta-analysis of observational and interventional studies.Global health action · 2022Pooled it
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- Vitamin D supplementation for term breastfed infants to prevent vitamin D deficiency and improve bone health.The Cochrane database of systematic reviews · 2020Pooled it
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- Vitamin D supplementation for women during pregnancy.The Cochrane database of systematic reviews · 2019Pooled it
- Effects of Vitamin D Supplementation During Pregnancy on Birth Size: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.Nutrients · 2019Pooled it
- Vitamin D supplementation higher than 2000 IU/day compared to lower dose on maternal-fetal outcome: Systematic review and meta-analysis.Women's health (London, England)Pooled it
- Examining the association of maternal oral health experiences with adverse birth outcomes: findings from Virginia's PRAMS survey.BMC oral health · 2026Article
- Vitamin D insufficiency in pregnant women from Lebanon: prevalence and key predictors.Reproductive health · 2025Article
- Inadequate Calcium and Vitamin D Intake Among Japanese Women During the Perinatal Period: A Cross-Sectional Study with Bone Health Assessment.Nutrients · 2025Article
- Article
- Effects of vitamin and mineral supplementation during pregnancy on maternal, birth, child health and development outcomes in low- and middle-income countries: A systematic review.Campbell systematic reviews · 2021Article
- Effectiveness of Vitamin D supplementation in combination with calcium on risk of maternal and neonatal outcomes: A quasi-experimental clinical trial.Tzu chi medical journalArticle
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionEvidence suggests a high prevalence of calcium and vitamin D deficiencies exists in both pregnant women and babies. Adequate intake of micronutrients has great importance especially during pregnancy and lactation period. Thus, the present study aimed at assessing the effect of vitamin D and calcium-vitamin D on pregnancy and birth outcomes (including duration of pregnancy, type of delivery and infant anthropometric indicators).
methodsA randomized, controlled, clinical, triple-blind trial conducted on 126 pregnant women referring to Tabriz health centers in 2013-14. Subjects were allocated into three groups using block randomization. Interventional groups received vitamin D, calcium-vitamin D and placebo pills daily for 60 days. ANCOVA and Chi-square tests were used for data analysis.
resultsBy controlling BMI before and during pregnancy, there were no significant differences between the group in average neonatal weight, height and head circumference, duration of pregnancy, type of delivery and gestational age at the time of delivery.
conclusionThe results show that calcium-vitamin D and vitamin D have no effect on duration of pregnancy, type of delivery and infant anthropometric indicators.
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