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Table 2 Summary of the 24-hour Average Pollutant Exposures Preceding Blood Measure in the Study Participants.

From: A community study of the effect of particulate matter on blood measures of inflammation and thrombosis in an elderly population

Variable (unit)

N

Min

25%

50%

75%

90%

Max

aOutdoor PM2.5 (μg/m3)

       

   Subject-days

133

1. 3

5.2

7.7

11.5

19.9

33.9

   Session

23

0.7

4.0

6.4

9.7

17.1

23.7

   Subject-sessionb

44

0.06

2.5

4.7

9.4

16.5

23.7

aIndoor PM2.5 (μg/m3)

       

   Subject-days

107

1.3

5.4

7.7

12.1

16.0

81.4

Central Site (Study-days)

       

   NO2 (ppb)

51

0.01

0.02

0.02

0.03

0.03

0.03

   Temperature (F)

58

35.5

41.4

45.3

50.4

57.0

67.8

   Relative Humidity

58

55.5

76.0

82.1

87.5

94.2

100.0

  1. aRepresents PM2.5 equivalent of actual nephelometric measure averaged from 8 am on prior day to 8 am on day of study.
  2. bSubjects with greater than two 24-hour average measures of PM2.5 equivalent during study session.
  3. The 1-day lagged measures are very similar; therefore, they are not displayed.
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Environmental Health

ISSN: 1476-069X