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Table 2 Summary distributions of the three-year average PM2.5 and its constituents before BP measurement

From: Association of fine particulate matter and its constituents with hypertension: the modifying effect of dietary patterns

Pollutants (µg/m3)

Mean

SD

Min

P25

Median

P75

Max

IQR

PM2.5

53.4

23.0

13.4

35.6

48.0

70.3

116.5

34.6

\({\text{SO}}_4^{2-}\)

9.9

3.9

3.2

6.6

9.0

13.0

21.3

6.3

\({\text{NO}}_3^{-}\)

10.8

5.4

2.0

6.4

9.6

15.0

26.1

8.6

\({\text{NH}}_4^{+}\)

7.5

3.4

1.8

4.7

6.9

10.1

17.3

5.4

BC

2.6

0.9

1.0

1.9

2.4

3.2

5.7

1.3

OM

13.1

5.3

5.3

9.1

11.7

16.7

32.2

7.6

  1. Abbreviations: PM2.5, fine particulate matter; \({\text{SO}}_4^{2-}\), sulfate; \({\text{NO}}_3^{-}\), nitrate; \({\text{NH}}_4^{+}\), ammonium; BC, black carbon; OM, organic matter; SD, standard deviation; IQR, interquartile range.
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Environmental Health

ISSN: 1476-069X