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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Circulation. 2020 Jun 30;142(9):858–867. doi: 10.1161/CIRCULATIONAHA.120.046321

Table 2:

Summary statistics and Pearson’s correlation coefficient of daily mean air pollutant concentrations, particle radioactivity levels and meteorological variables in Boston, USA, during the study period from September 1, 2006 until June 30, 2010.

Summary statistics Pearson’s correlation coefficient
# Days Min 25th percentile 50th percentile 75th percentile Max PM2.5 PR
PM2.5 (μg/m3) 1128 2.23 6.27 8.42 12.52 55.21 1 0.35
PR (mBq/m3) 1128 0.06 0.14 0.19 0.23 0.56 0.35 1
Temperature (°C) 1128 −12.74 1.94 11.35 18.62 28.05 0.20 −0.11
Dew point temperature (°C) 1128 −20.08 −1.37 6.22 14.31 23.57 0.24 −0.14