Table 1.
Summary Statistics of Particles (μg/m3) by Job Title and Location
| EC | OC | PM2.5 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Obs | Avg | SD | GM | GSD | Obs | Avg | SD | GM | GSD | Obs | Avg | SD | GM | GSD | |
| Dockworker | |||||||||||||||
| Non-smoker | 398 | 1.0 | 0.8 | 0.8 | 2.1 | 398 | 14.7 | 6.8 | 13.8 | 1.5 | 364 | 21.5 | 13.6 | 18.5 | 1.7 |
| Smoker | 124 | 1.4 | 1.0 | 1.0 | 1.9 | 124 | 29.1 | 22.6 | 24.0 | 1.9 | 119 | 43.4 | 43.4 | 34.5 | 2.0 |
| Dock Area | 483 | 1.0 | 0.8 | 0.7 | 2.8 | 483 | 8.1 | 4.1 | 7.4 | 1.5 | 475 | 16.4 | 20.7 | 13.5 | 1.9 |
| Mechanic | |||||||||||||||
| Non-smoker | 107 | 4.4 | 9.1 | 2.0 | 3.8 | 107 | 19.4 | 13.8 | 16.9 | 1.6 | 102 | 42.2 | 38.8 | 31.1 | 2.0 |
| Smoker | 32 | 3.5 | 2.6 | 2.4 | 2.3 | 32 | 29.6 | 16.3 | 24.4 | 1.8 | 33 | 56.0 | 41.1 | 41.7 | 1.9 |
| Shop Area | 214 | 3.0 | 4.0 | 1.5 | 3.5 | 214 | 13.0 | 9.6 | 10.4 | 2.0 | 211 | 27.6 | 27.5 | 19.3 | 2.4 |
| Yard | 348 | 0.8 | 1.0 | 0.5 | 3.3 | 348 | 5.3 | 3.0 | 4.6 | 1.7 | 339 | 11.9 | 8.7 | 8.9 | 2.4 |
*
The geometric mean (GM) is an estimator of the median, and the geometric standard deviation (GSD) is a multiplicative factor, e.g. one standard deviation above the GM is GM*GSD