Table 4.

Increased risk of mortality for heat-wave days compared with non-heat-wave days under different heat wave definitions in Seoul.

≥ 2 days duration			≥ 3 days duration
Intensity	No. of heat waves	Estimate (%) [mean (95% CI)]	No. of heat waves	Estimate (%) [mean (95% CI)]
≥ 97th percentile		12		1.8 (–7.2, 11.7)		4		3.8 (–27.1, 47.8)
≥ 98th percentile		9		8.4 (0.1, 17.3)		3		13.5 (–0.1, 28.9)
≥ 99th percentile		2		8.7 (–11.4, 33.4)		1		0.1 (–14.3, 16.9)