METHODS: A systematic review of the literature will be conducted. The search will be performed in electronic databases: CINAHL; MEDLINE; Cochrane Central Register of Controlled Trials; Cochrane Library; Academic Search Complete; Information Science and Technology Abstracts; MedicLatina; SCOPUS; PubMed; and Google Scholar, with the chronological range of January 2018 to November 2022. The search strategy will include the following Medical Subject Headings or similar terms: \'Vitamin D\'; \'25-hydroxyvitamin D\'; \'Hypovitaminosis D\'; \'Pregnancy\'; \'Pregnant women\'; \'Expectant mother\'; \'Prematurity\'; \'Premature birth\'; \'Premature delivery\'; \'Preterm birth\'; and \'Preterm labour\'. This review will include quantitative primary studies, both experimental (clinical trials) and observational (cohort, cross-sectional, and case-control). The quality of each selected study and the results obtained will be assessed by two reviewers separately, using the Cochrane risk of bias tool for evaluating randomised clinical trials or the Newcastle Ottawa Scale for non-randomised studies, following the respective checklist. In case of disagreement, a third reviewer will be consulted.
BACKGROUND: This study does not involve human subjects and therefore does not require ethics approval. The results will be disseminated through publication in a peer-reviewed scientific journal and through conference presentations. All changes made to the protocol will be registered in PROSPERO, with information on the nature and justification for the changes made.
UNASSIGNED: CRD42022303901.
方法:将对文献进行系统回顾。搜索将在电子数据库中进行:CINAHL;MEDLINE;Cochrane中央对照试验注册;Cochrane图书馆;学术搜索完成;信息科学和技术文摘;MedicLatina;SCOPUS;PubMed;和GoogleScholar,时间顺序为2018年1月至2022年11月。搜索策略将包括以下医学主题词:\'维生素D\';\'25-羟基维生素D\';\'维生素D缺乏症\';\'怀孕\';\'孕妇\';\'准妈妈\';\'早产\';\'早产\';\'早产\';\'早产\';这篇综述将包括定量的初步研究,实验(临床试验)和观察(队列,横截面,和病例控制)。每个选定研究的质量和获得的结果将分别由两名评审员评估,使用Cochrane偏倚风险工具评估随机临床试验或纽卡斯尔渥太华量表进行非随机研究,按照各自的检查表。如果有分歧,将咨询第三位审稿人。
背景:这项研究不涉及人类受试者,因此不需要伦理学批准。结果将通过在同行评审的科学期刊上发表和通过会议介绍来传播。对协议所做的所有更改都将在PROSPERO中注册,提供有关更改的性质和理由的信息。
■CRD42022303901。