Table 4.

Relative risks and their 95% confidence intervals of cold and heat effects of low and high temperatures on admissions by gender and age, with reference at −12 °C.

Variable	Extreme colda	Moderate coldb	Moderate heatc	Extreme heatd
Male	0.93 (0.79–1.09)	0.98 (0.97–1.00)	1.00 (0.93–1.08)	1.02 (0.94–1.11)
Female	0.94 (0.90–0.98)*	0.97 (0.95–0.99)*	1.01 (0.99–1.04)	1.01 (0.97–1.06)
<65 years	0.95 (0.80–1.13)	0.98 (0.90–1.06)	1.01 (0.99–1.04)	1.01 (0.97–1.05)
≥65 years	0.95 (0.91–0.98)*	0.97 (0.96–0.99)*	1.01 (0.92–1.11)	1.02 (0.93–1.122)

*p < 0.05.

^aThe 2.5th percentile of temperature (−5 °C) relative to the 25th percentile of temperature (2 °C).

^bThe 10th percentile of temperature (−2 °C) relative to the 25th percentile of temperature (2 °C).

^cThe 90th percentile of temperature (24 °C) relative to the 75th percentile of temperature (20 °C).

^dThe 97.5th percentile of temperature (27 °C) relative to the 75th percentile of temperature (20 °C).