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Subgroup meta-analysis for the effect of omega-3 supplementation on primary or secondary prevention of all-cause mortality. Full black quadrilateral represents the point estimate of individual studies and blank with quadrilateral represents pooled estimates. RR, relative risk; CI, confidence interval; EPA, eicosapentaenoic acid; DHA, docosahexaenoic acid. ALA, alpha-linolenic acid. Pooled estimates for the overall study population and subgroups are highlighted with bold font.
