However, the pooled effect of meta-analysis on the association between PM 2.5 and all-cause mortality in the elderly population was marginally significant (RR, 1.09; 95% CI, 0.99–1.21).
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A Systematic Review and Meta-Analysis on Long-Term Exposure to Particulate Matter and All-Cause and Cause-Specific Mortality in the Asia-Pacific States.
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The sentences
Regarding respiratory, COPD, and ALRI mortality, we observed a marginal association with an increase in PM 2.5 , although it did not reach statistical significance.