Table 4.

Panel analysis of the associations between daily API and climate factors.

	Pooled model								One-way fixed effect model
	1		2		3		4		1		2		3		4
	Beta	p-Value	Beta	p-Value	Beta	p-Value	Beta	p-Value	Beta	p-Value	Beta	p-Value	Beta	p-Value	Beta	p-Value
Year 2012
Sample size (n)	2597		2592		2575		2575		2597		2592		2575		2575
Heat index	−0.005	<0.0001	−0.003	<0.0001	−0.003	<0.0001	−0.004	<0.0001	−0.321	<0.0001	−0.331	<0.0001	−0.353	<0.0001	−0.444	<0.0001
Precipitation (0.1 mm)			−0.002	<0.0001	−0.002	<0.0001	−0.002	<0.0001			−0.091	<0.0001	−0.102	<0.0001	−0.097	<0.0001
Sunshine hours (h)					0.000	0.906	0.004	0.033					−0.410	0.012	0.031	0.858
Pressure (kPa)							0.006	<0.0001							0.642	<0.0001
Fixed time effect (53 weeks)									Y		Y		Y		Y
R2	0.134		0.202		0.197		0.208		0.285		0.314		0.312		0.330
Year 2013
Sample size (n)	1047		1047		1047		1047		2597		2592		2575		2575
Heat index	−0.590	<0.0001	−0.510	<0.0001	−0.404	<0.0001	−0.423	<0.0001	−0.605	<0.0001	−0.650	<0.0001	−0.640	<0.0001	−0.659	<0.0001
Precipitation (0.1 mm)			−0.124	<0.0001	−0.183	<0.0001	−0.177	<0.0001			−0.105	<0.0001	−0.141	<0.0001	−0.133	<0.0001
Sunshine hours (h)					−2.936	<0.0001	−2.588	<0.0001					−1.701	0.0003	−1.418	0.003
Pressure (kPa)							0.630	0.009							1.114	0.0004
Fixed time effect (53 weeks)									Y		Y		Y		Y
R2	0.145		0.165		0.205		0.210		0.402		0.413		0.421		0.428

Beta, regression coefficient.