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Table 1 Summary statistics of daily ILI counts, PM2.5, and weather conditions in Beijing, China, during January 1, 2008 to December 31, 2014 (Q1, Q2 and Q3 denote the 25th, 50th and 75th percentile, respectively)

From: Impact of ambient fine particulate matter (PM2.5) exposure on the risk of influenza-like-illness: a time-series analysis in Beijing, China

Variable

Flu season (October-April)

Non-flu season (May-September)

Mean ± SD

Minimum

Q1

Q2

Q3

Maximum

Mean ± SD

Minimum

Q1

Q2

Q3

Maximum

Daily ILI counts by age groups

 <5

695.45(227.78)

270

529

673

815

1717

657.45(152.24)

357

539

648

782

1088

 5–14

448.38(250.29)

124

311

389

505

2794

349.26(86.40)

153

289

341

406

710

 15–24

191.29(225.80)

32

90

119

205

2097

104.44(25.47)

44

86

103

120

197

 25–59

356.89(294.82)

79

179

246

429

1627

218.73(63.67)

78

176

211

260

512

 60+

71.24(53.97)

10

40

54

83

381

51.52(22.86)

16

38

48

62

447

Fine airborne particulate matter (μg/m 3)

  PM 2.5

100.66(80.86)

2.92

44.50

77.62

131.00

568.00

90.14(53.24)

9.79

52.25

83.26

115.70

463.00

Meteorological Measures

 Temperature

7.13(8.87)

−12.50

−0.90

6.35

14.72

26.60

25.09(3.36)

11.20

23.30

25.60

27.50

34.50

 Humidity

47.39(19.82)

8

30

46

63

95

59.86(17.63)

13

48

63

73

97