The quadratic term is highly significant, and a non-linear relationship is suggested.
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Association of atmospheric temperature with out-of-hospital natural deaths occurrence before and during the COVID-19 pandemic in Osaka, Japan.
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In conclusion, the risk of OHND increased in both hot and cold environments, with a clear trend among the elderly and living-alone groups.
The sensitivity analysis results with a reference age of 75 years showed a trend similar to that of the main subgroup analysis (Supplementary Table S4 online).