Table 2. Descriptive statistics of daily deaths, ambient PM_2.5 concentrations and meteorological factors in Shanghai, China (2012–2014).

	Mean ± SD	n	Percentiles
			Min	P25	P50	P75	Max
Daily deaths
Overall	307±51	1096	196	269	294	339	526
January	390±40	93	316	360	388	415	526
February	358±29	85	292	339	362	371	470
March	334±35	93	256	309	334	358	429
April	298±29	90	227	279	297	319	373
May	275±24	93	196	260	277	293	330
June	259±24	90	215	240	256	276	332
July	278±26	93	231	261	274	294	352
August	275±24	93	207	261	273	285	336
September	274±24	90	201	259	274	289	332
October	277±24	93	225	262	271	292	341
November	301±23	90	249	282	302	318	363
December	366±40	93	284	345	361	387	515
PM2.5 (μg/m3)
Overall	55.0±38.6	1091	3.0	29.4	45.5	68.7	447.5
January	78.6±47.3	93	17.5	41.4	58.2	106.2	201.0
February	54.6±33.5	85	8.4	29.4	45.6	72.4	183.0
March	62.5±35.4	93	18.2	37.4	56.6	78.2	191.3
April	56.9±21.4	88	16.1	43.3	55.2	66.6	144.4
May	59.2±29.7	90	18.2	37.7	50.2	70.2	151.0
June	46.2±27.9	90	9.3	23.1	38.0	59.0	127.5
July	38.5±24.1	93	3.0	20.8	39.0	50.2	119.2
August	29.2±18.1	93	4.2	14.0	25.3	39.0	78.2
September	35.7±23.3	90	12.6	19.6	29.7	43.9	125.5
October	43.0±29.6	93	8.4	23.5	36.6	50.2	204.3
November	66.6±40.0	90	21.0	36.6	55.0	86.8	214.0
December	88.2±62.1	93	13.3	54.2	74.4	102.2	447.5
Meteorological factors
Temperature (°C)	17.2±9.0	1096	-1.2	8.8	18.2	24.3	35.0
Barometric Pressure (kPa)	101.6±0.9	1096	99.5	100.8	101.6	102.3	103.8
Relative Humidity (%)	70.3±12.6	1096	30	62	72	80	98
Wind speed (m/s)	2.80±0.97	1096	0.6	2.1	2.7	3.4	8.6
Precipitation (mm)	3.26±10.35	1096	0	0	0	1.1	195.3
Sunshine (hour)	4.70±3.95	1096	0	0	4.8	8.2	12.9

SD, standard deviation); Px, x^th percentiles; Min, minimum; Max, maximum