Escalated heatwave mortality risk in sub-Saharan Africa under recent warming trend.

Similarly, compound day-night heatwaves showed a significant escalation in mortality impact, transitioning from a nonsignificant protective association in 2005 to 2009 [OR = 0.94 (95% CI: 0.77 to 1.04)] to a significant risk factor in 2010 to 2015 [OR = 1.11 (95% CI: 1.03 to 1.22)], with this temporal change being highly significant ( P = 0.008).

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Although some estimates did not reach statistical significance because of smaller case numbers within individual regions, the overall temporal patterns were consistent, indicating that the observed changes were not driven by any single region.

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