Lower air temperature is associated with ambulance transports and death in Takamatsu area, Japan

Table 3 Approximation by quadratic curve between ambulance transports (/a hundred thousand people/day) and climate parameters

	Total				Acute disease
	r	p	r	p	Quadratic curve (Y: ambulance transports, X: climate parameters)
Mean air temperature (°C)	0.303	0.0065	0.451	<0.0001	Y = 0.006X ² − 0.227X + 7.692
Mean of the highest air temperature (°C)	0.310	0.0049	0.463	<0.0001	Y = 0.006X ² − 0.267X + 8.643
Mean of the lowest air temperature (°C)	0.285	0.0115	0.429	<0.0001	Y = 0.006X ² − 0.174X + 6.873
The highest air temperature (°C)	0.232	0.0554	0.370	0.0004	Y = 0.004X ² − 0.217X + 8.894
The lowest air temperature (°C)	0.338	0.0017	0.449	<0.0001	Y = 0.006X ² − 0.132X + 6.238
Mean humidity (%)	0.133	0.3896	0.129	0.4172
The lowest humidity (%)	0.223	0.0680	0.271	0.0180	Y = −0.002X ² + 0.107X + 4.658
Daylight hours (h/month)	0.075	0.7426	0.142	0.3450

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