ArticleInternational journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics2025
Vitamin D deficiency in a subfertility population and the impact of COVID-19 lockdowns.
Article in International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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
2 citing papers in PubMed.
- Analytical Evaluation of the Autobio 25-OH Vitamin D Assay: Comparison with Liquid Chromatography-Tandem Mass Spectrometry and Clinical Implications.Metabolites · 2025Article
- Vitamin D deficiency in a subfertility population and the impact of COVID-19 lockdowns.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2025Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveTo evaluate the burden of vitamin D deficiency in female patients attending a fertility clinic in a tertiary referral center, assess temporal trends-including the potential impact of COVID-19 lockdowns-and explore socioeconomic disparities in vitamin D levels.
methodsThis retrospective cohort study analyzed vitamin D measurements from 765 female patients (mean age 35.7 ± 5.8 years) attending a fertility clinic between March 2010 and May 2022. Vitamin D status was categorized as deficient (<30 nmol/L), insufficient (30-50 nmol/L), or normal (>50 nmol/L). Comparative analyses examined pre- and post-COVID periods and healthcare funding status.
resultsOverall, 39.9% (n = 305) of patients exhibited suboptimal vitamin D levels, with 8.8% (n = 67) deficient and 31.1% (n = 238) insufficient. Mean serum 25(OH)D was 62.8 ± 27.4 nmol/L. No statistically significant difference was observed between pre-COVID (44.2% suboptimal) and post-COVID (38.1% suboptimal) periods (OR 0.78, 95% CI: 0.57-1.06, P = 0.110). However, marked seasonal variation was identified, with winter values significantly lower than summer values (45.3 ± 24.6 vs. 72.1 ± 28.3 nmol/L, P < 0.001). Furthermore, state-funded patients had a significantly higher rate of suboptimal vitamin D status (50.2%, n = 107) compared to self-funded patients (35.9%, n = 198, P < 0.001).
conclusionOur findings demonstrate a high prevalence of suboptimal vitamin D levels in a subfertility population, with significant seasonal fluctuations and notable socioeconomic disparities. Despite initial concerns, COVID-19 lockdown measures did not appear to adversely affect overall vitamin D status. These results support the incorporation of routine vitamin D screening in infertility evaluations and the implementation of targeted supplementation, particularly in economically vulnerable groups and during winter months.
Indexed as
Identifiers
What Socratic holds
Registered trials
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.