Table 2.

Relative risk (RR) and attributable fraction of hospitalizations for CKD associated with ambient high temperature (every 1 °C increase in daily mean temperature in hot season), grouped by three temperature zones

Variable	RR (95% CI)	P-values for difference	Attributable fraction (%)
Overall	1.008 (1.003–1.012)	–	5.500 (− 13.549 to 20.730)
Temperature zone
Temperate zone	0.999 (0.985–1.013)	Ref	–
Warm-temperate zone	1.004 (0.996–1.012)	0.544	–
Sub-tropical zone	1.011 (1.006–1.017)	0.120	7.124 (− 7.419 to 19.355)

CKD chronic kidney disease, CI confidence interval, Ref reference