Prevalence of vitamin B complex deficiencies in women in reproductive age, pregnant, or lactating woman in Brazil: a systematic review and meta-analysis protocol.

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  • Additional Information
    • Source:
      Publisher: BioMed Central Country of Publication: England NLM ID: 101580575 Publication Model: Electronic Cited Medium: Internet ISSN: 2046-4053 (Electronic) Linking ISSN: 20464053 NLM ISO Abbreviation: Syst Rev Subsets: MEDLINE
    • Publication Information:
      Original Publication: London : BioMed Central
    • Subject Terms:
      Vitamin B Complex* ; Malnutrition* ; Vitamin B Deficiency*; Pregnancy ; Humans ; Female ; Child ; Adolescent ; Young Adult ; Adult ; Middle Aged ; Lactation ; Prevalence ; Brazil/epidemiology ; Cross-Sectional Studies ; Folic Acid ; Meta-Analysis as Topic ; Systematic Reviews as Topic
    • Abstract:
      Background: Vitamin B deficiencies are involved with several outcomes in fertility and pregnancy. In Brazil, the national prevalence rates of these micronutrient deficiencies in women of reproductive age were not known. This study aims to systematically identify, select, evaluate, analyze, and report the prevalence rates of vitamin B complex deficiencies in women of reproductive age in Brazil and identify variables that may modify the outcome rates.
      Methods: A systematic review will be conducted guided by the following question: "What is the prevalence of vitamin B deficiencies in women of reproductive age in Brazil?". The studies will be identified and selected from a literature search using electronic databases, consultation with researchers/specialists, and reference lists of eligible studies and reviews on the topic. Major eligibility criteria include observational cross-sectional and cohort studies carried out in Brazil and performed in women 10-49 years old, or pregnant and lactating mothers, and investigated the deficiency of vitamin B complex by laboratory test. Two reviewers independently will perform the screening and selection of the studies, data extraction, and risk of bias assessment. For the data report, a narrative approach will be used to present the characteristics of the included studies and individual findings. A random meta-analysis model will be implemented to summarize the individual prevalence rates in a global value if the studies are sufficiently homogeneous.
      Discussion: This study aims to identify the national and regional prevalence rates of vitamin B complex deficiencies in women of reproductive age; allow the policymakers discuss, plan, and implement public policies to screen; and prevent and/or treat these malnutrition conditions. This also aims to know the rates of nutritional deficiencies over the years, serving as an indirect indicator of the socioeconomic and dietary patterns of the population. Specifically for folate, this study allows to compare the prevalence rates of deficiency of this vitamin before and after the mandatory fortification of wheat and corn flours implemented since 2004 in Brazil, in this specific population. The evidence gathered may highlight the need for population-based studies to investigate the deficiency of these vitamins.
      Systematic Review Registration: PROSPERO CRD42020188474.
      (© 2023. The Author(s).)
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    • Contributed Indexing:
      Keywords: Brazil; Childbearing age; Fertile period; Fertility; Lactation; Nutritional deficiency; Pregnancy; Systematic review; Vitamins B complex; Women
    • Accession Number:
      12001-76-2 (Vitamin B Complex)
      935E97BOY8 (Folic Acid)
    • Publication Date:
      Date Created: 20230126 Date Completed: 20230127 Latest Revision: 20230214
    • Publication Date:
      20230214
    • Accession Number:
      PMC9875441
    • Accession Number:
      10.1186/s13643-022-02136-7
    • Accession Number:
      36698215