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Table 2 Basic characteristics of exposure variables

From: Exposure measurement error in PM2.5 health effects studies: A pooled analysis of eight personal exposure validation studies

 

# person-months

Mean ± SD

 

(# subjects)

( μ g/m3)

All Year

  

Total Personal PM2.5

919 (490)

24.54 ± 18.97

Personal PM2.5 of ambient origin

261 (141)

9.71 ± 4.32

Personal/Ambient SO 4 2 − ratio a

241 (131)

0.64 ± 0.25

Model Predicted PM2.5

1029 (502)

15.47 ± 4.77

Monitor PM2.5

1029 (502)

15.86 ± 5.58

Summer

  

Total Personal PM2.5

429 (312)

23.92 ± 16.92

Personal PM2.5 of ambient origin

130 (90)

10.95 ± 4.12

Personal/Ambient SO 4 2 − ratio a

125 (86)

0.70 ± 0.23

Model Predicted PM2.5

493 (327)

15.67 ± 4.84

Monitor PM2.5

493 (327)

15.69 ± 4.79

Winter

  

Total Personal PM2.5

490 (353)

23.94 ± 19.67

Personal PM2.5 of ambient origin

131 (97)

8.73 ± 4.27

Personal/Ambient SO 4 2 − ratio a

116 (87)

0.59 ± 0.24

Model Predicted PM2.5

536 (367)

15.36 ± 4.71

Monitor PM2.5

536 (367)

16.10 ± 6.21

  1. aNot estimated for Seattle, WA.