Table 2.
Distributions of O3 and PM2.5 exposure by demographic characteristics.a
| 2002–2007 (n = 11,259) |
||||
|---|---|---|---|---|
| Ozone |
PM2.5 |
|||
| Concentration (SD) in ppb |
p-value | Concentration (SD) in μg/m3 |
p-value | |
| Overall | 38.3 (3.67) | 12.7 (2.47) | ||
| Sex | 0.426 | 0.982 | ||
| Female | 38.3 (3.67) | 12.7 (2.49) | ||
| Male | 38.3 (3.67) | 12.7 (2.49) | ||
| Race/ethnicity | <0.0001 | <0.0001 | ||
| Non-Hispanic Black | 38.6 (3.35) | 13.6 (2.05) | ||
| Non-Hispanic White | 38.6 (3.45) | 12.2 (2.27) | ||
| Hispanic | 37.0 (4.18) | 12.8 (3.28) | ||
| Other | 36.1 (4.85) | 13.4 (3.06) | ||
a
t-tests with unequal variances were used to test for differences in O3 and PM2.5 exposure by sex. The Kruskal Wallis test was used to test for differences in O3 and PM2.5 by racial/ethnic group. P-values in the table correspond to those obtained from t-tests (sex) and Kruskal Wallis tests (race/ethnicity). Additionally, a Dunn’s test was used for pairwise comparisons of air pollutant concentrations for different racial/ethnic groups.