Comprehensive quantitative evidence on the risk and protective factors for sudden infant death syndrome (SIDS) effects is lacking. We investigated the risk and protective factors related to SIDS.
Methods
We conducted an umbrella review of meta-analyses of observational and interventional studies assessing SIDS-related factors. PubMed/MEDLINE, Embase, EBSCO, and Google Scholar were searched from inception until January 18, 2023. Data extraction, quality assessment, and certainty of evidence were assessed by using A Measurement Tool Assessment Systematic Reviews 2 following PRISMA guidelines. According to observational evidence, credibility was graded and classified by class and quality of evidence (CE; convincing, highly suggestive, suggestive, weak, or not significant). Our study protocol was registered with PROSPERO (CRD42023458696). The risk and protective factors related to SIDS are presented as equivalent odds ratios (eORs).
Results
We identified eight original meta-analyses, including 152 original articles, covering 12 unique risk and protective factors for SIDS across 21 countries/regions and five continents. Several risk factors, including prenatal drug exposure [eOR = 7.84 (95% CI = 4.81–12.79), CE = highly suggestive], prenatal opioid exposure [9.55 (95% CI = 4.87–18.72), CE = suggestive], prenatal methadone exposure [9.52 (95% CI = 3.34–27.10), CE = weak], prenatal cocaine exposure [4.38 (95% CI = 1.95–9.86), CE = weak], prenatal maternal smoking [2.25 (95% CI = 1.95–2.60), CE = highly suggestive], postnatal maternal smoking [1.97 (95% CI = 1.75–2.22), CE = weak], bed sharing [2.89 (95% CI = 1.81–4.60), CE = weak], and infants found with heads covered by bedclothes after last sleep [11.01 (95% CI = 5.40–22.45), CE = suggestive], were identified. On the other hand, three protective factors, namely, breastfeeding [0.57 (95% CI = 0.39–0.83), CE = non-significant], supine sleeping position [0.48 (95% CI = 0.37–0.63), CE = suggestive], and pacifier use [0.44 (95% CI = 0.30–0.65), CE = weak], were also identified.
Conclusions
Based on the evidence, we propose several risk and protective factors for SIDS. This study suggests the need for further studies on SIDS-related factors supported by weak credibility, no association, or a lack of adequate research.
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