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Table 2 BC and PM2.5 exposure distributions for Normative Aging Study participantsa

From: Exposure to sub-chronic and long-term particulate air pollution and heart rate variability in an elderly cohort: the Normative Aging Study

Pollutants (moving averages) N visits Mean (SD) 5th–95th percentiles IQR
BC (μg/m3)     
 3 days 1161 0.43 (0.29) 0.12–0.93 0.29
 7 days 1161 0.44 (0.26) 0.14–0.85 0.28
 14 days 1160 0.44 (0.25) 0.14–0.81 0.26
 21 days 1153 0.44 (0.24) 0.14–0.81 0.26
 28 days 1148 0.44 (0.24) 0.15–0.81 0.26
 1 year 974 0.45 (0.17) 0.22–0.74 0.19
PM2.5 (μg/m3)     
 3 days 920 9.40 (4.48) 3.79–18.60 5.44
 7 days 918 9.41 (3.32) 4.74–15.94 4.44
 14 days 920 9.46 (2.91) 5.30–14.61 3.95
 21 days 916 9.51 (2.67) 5.62–14.50 3.59
 28 days 911 9.49 (2.53) 5.82–14.15 3.55
 1 year 806 9.71 (1.36) 7.40–11.64 2.01
  1. BC black carbon, IQR interquartile range, PM 2.5 particulate matter <2.5 μm in aerodynamic diameter, SD standard deviation
  2. aStudy visits with information on BC spanned 2000 and 2011. Study visits with information on PM2.5 spanned 2003 and 2011