Table 1.

Year-Round and Seasonal Stratified Summary Statistics for Daily Mortality, PM_2.5 Mass and Chemical Constituents, and Meteorological Factors in Beijing, China (from January 2013 to December 2015)

		year-round				warm seasons		cold seasons
	days of data available	mean	SD	IQR	min, max	mean	SD	mean	SD
cause of mortality
all cause (excluded external deaths)	1083	81	13	19	46, 126	74	10	88	12
male	1083	42	9	13	20, 74	38	8	46	9
female	1083	39	9	12	19, 70	36	8	43	9
0–64 years old	1083	19	5	6	6, 39	18	4	21	5
65–74 years old	1083	14	4	6	4, 27	13	3	15	4
>74 years old	1083	48	9	12	20, 81	43	7	53	9
cardiovascular diseases	1083	39	9	12	15, 70	35	7	44	8
respiratory diseases	1083	8	4	4	1, 24	7	3	10	4
air pollution (24-h average, μg/m3)
PM2.5	1095	92.6	77.4	83.0	5.5, 512.2	78.1	60.7	107.4	89.0
organic carbon	1078	15.52	11.49	10.11	0.05, 84.77	11.41	6.31	19.62	13.79
elemental carbon	1078	2.28	1.95	2.03	0.05, 17.59	1.73	1.34	2.83	2.28
Na+	1079	1.46	6.72	0.89	0.05, 128.63	0.41	0.36	2.54	9.42
K+	1049	1.58	5.62	1.01	0.05, 91.65	0.63	2.61	2.61	7.50
NH4+	1080	11.97	11.65	12.44	0.05, 73.88	10.38	10.02	13.58	12.90
Ca2+	1080	0.40	0.61	0.37	0.05, 6.38	0.32	0.50	0.49	0.69
Mg2+	1077	0.15	0.44	0.05	0.05, 8.55	0.09	0.12	0.21	0.60
Cl−	1082	2.34	3.28	2.86	0.05, 27.61	0.87	1.33	3.84	3.93
NO3−	1082	14.23	16.72	14.50	0.05, 126.13	11.76	13.62	16.74	19.05
SO42−	1083	18.52	18.19	20.10	0.05, 120.00	14.88	13.90	21.99	21.10
meteorological parameters
temperature (°C)	1094	13.7	11.0	20.6	−9.7, 32.6	22.6	5.3	4.5	7.0
humidity (%)	1095	54	20	31	8, 99	61	17	47	20