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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.