Table 2. Summary statistics for daily exposure variables during the study period (2001–2018)

Exposure variables	Case periods (n=6,526)		Control periods (n=14,539)		Mean difference	95% CI	P-value
	Mean	SD	Mean	SD
PM10(μg/m3)	53.31	30.68	52.70	29.43	−0.61	(−1.48, 0.26)	0.19
Mean temperature (℃)	13.41	13.16	13.49	13.32	0.08	(−0.23, 0.38)	0.63
Mean humidity (%)	61.41	15.00	61.48	14.97	0.07	(−0.37, 0.51)	0.75

PM₁₀, particulate matter ≤10 μm in diameter.