Skip to main content

Table 3 Season-adjusted calibration factors for personal PM 2.5 of ambient origin and total personal PM 2.5

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

  Monitor PM2.5 Model predicted PM2.5
Personal PM 2.5 of ambient 5 cities (141 subjects)
origin   
Estimate (95% CI)a 0.31 (0.14, 0.47)** 0.54 (0.42, 0.65)**
p-value for between-city 0.0034 0.1114
heterogeneity   
R I b 10.75% 0.96%
Estimate (95% CI)c N/A 0.56 (0.44, 0.68)**
Total Personal PM 2.5 9 cities (490 subjects)
Estimate (95% CI)a 0.56 (0.24, 0.88)** 0.81 (0.49, 1.12)
p-value for between-city 0.0084 0.1712
heterogeneity   
R I b 2.54% 1.28%
Estimate (95% CI)c N/A 0.79 (0.54, 1.04)**
  1. *p-value1 < 0.05, **p-value1 < 0.01 for significant difference from 1.
  2. aResults from Model 1 (including random slopes for cities, g 3i ).
  3. bR I : the proportion of variance explained by the between-cities heterogeneity.
  4. cResults from Model 2, when no significant between-city heterogeneity was detected (without the random slopes for cities, g 3i ).