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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: Ann Epidemiol. 2015 Feb 12;25(7):505–511. doi: 10.1016/j.annepidem.2015.02.003

Table 2.

Descriptive statistics of PNC for monitored and predicted data from November 14, 2009 through September 25, 2010

Measurement No. of days (%), n = 390 Mean ± SD Min 25th percentile Median 75th percentile Max
Daily average PNC concentration
SPH 315 (100%) 14,163 ± 7243 3201 7314 14,135 19,964 31,978
MAC 275 (87%) 15,544 ± 11,525 654 7318 10,936 15,641 166,610
RHA* 315 (100%) 24,075 ± 9748 8231 16,229 22,065 31,085 57,840

max = maximum; min = minimum; RHA = residential hourly-averaged concentrations.

*

24-hour average measurement across all participants.