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.