Table 2.

Daily statistics for weather factors and ambient pollutants.

Variables	Mean	SD	Minimum	25%	50%	75%	Maximum	IQR
ED visits for PD, N	92	12	58	84	93	100	140	56
Temperature, °C	13.6	10.6	−14.4	3.7	14.9	23.2	31.2	19.5
Humidity, %	59.5	14.4	36.6	48.4	60.1	69.5	97.3	21.1
Pressure, hPa	1016.4	8.5	1004.2	1009.3	1016.7	1023.1	1035.3	13.8
PM2.5, μg/m3	24.8	15.2	0.0	14.0	22.0	32.0	168.0	18.0
PM10, μg/m3	46.7	38.4	1.0	27.0	40.0	57.0	1160.0	30.0
O3, ppm	0.023	0.019	0.000	0.008	0.020	0.033	0.168	0.0
NO2, ppm	0.032	0.016	0.000	0.019	0.029	0.042	0.145	0.0
CO, ppm	0.523	0.242	0.000	0.400	0.500	0.600	3.400	0.2
SO2, ppm	0.005	0.002	0.000	0.004	0.005	0.006	0.030	0.0

SD, standard deviation; IQR, interquartile range; ED, emergency department; PD, psychiatric disease; PM_2.5, particular mass <2.5 μm; PM₁₀, particular mass <10 μm; O₃, trioxide (ozone); NO₂, nitric dioxide; CO, carbon oxide; SO₂, sulfur dioxide.