The relationship between vitamin D and abortion: a systematic review and meta-analysis
Bibliographic record
Abstract
Introduction: Spontaneous abortion is one of the common complications of pregnancy that its etiology is unknown. Since vitamin D deficiency may be one of its causes, this systematic review was performed with aim to evaluate the relationship between vitamin D and abortion. Methods: In this systematic review and meta-analysis, the literature published from 1990 until the end of 2019 were searched in databases of PubMed, Embase, Cochrane Library, Scopus, Web of Science, SID, Magiran, IranMedex with the keywords of Vitamin D, 25-hydroxyvitamin, 25-Dihydroxyvitamin D3, Pregnancy loss, fetal loss, miscarriage and abortion and the equivalent Persian keywords. The quality of the papers was examined using Ottawa checklist, and STATA software was used for the meta-analysis. Results: Among 311 papers found in the first stage, finally 5 papers (5203 individuals) met the study criteria. In terms of methodological quality, all of the included articles were of average level. The findings of the studies included in the meta-analysis showed that there is a relationship between low levels of vitamin D and abortion (Effect size: 0.02; 95% Confidence Interval: -0.02 to 0.06). Conclusion: The results of the meta-analysis suggested a relationship between serum level of vitamin D and abortion; thus, it can be concluded that low levels of vitamin D are considered as a risk factor for abortion.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.007 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.011 | 0.002 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".