Table 2. Summaries of exposure measures by group.
| Characteristic | Median PM2.5 (IQR) | Wilcoxon Estimated Difference (CI) | Wil-coxon p value | Permu-tation p value |
|---|---|---|---|---|
| Mean Monthly PM2.5 (μg/m3) | 3.3 (-3.8–17.6) | >0.20 | = 0.11 | |
| Uses Hood Fan (n = 29) | 8.96 (6.57–11.70) | |||
| Does Not Use Hood Fan (n = 6) | 14.08 (5.44–25.42) | |||
| Median Monthly PM2.5 (μg/m3) | 2.1 (-3.0–7.6) | >0.20 | = 0.09 | |
| Uses Hood Fan | 6.67 (4.87–9.18) | |||
| Does Not Use Hood Fan | 8.55 (3.99–12.16) | |||
| % of Hours the PM2.5 >12 μg/m3 | 5.6 (-3.8–46.4) | >0.20 | = 0.06 | |
| Uses Hood Fan | 7.81% (4.07–18.84) | |||
| Does Not Use Hood Fan | 28.71% (5.41–50.37) | |||
| % of Hours the PM2.5 >35 μg/m3 | 2.3 (-0.44–18.0) | = 0.15 | <0.01* | |
| Uses Hood Fan | 0.95% (0.37–2.15) | |||
| Does Not Use Hood Fan | 8.99% (0.96–18.09) | |||
| Distance to Nearest Roadway (m) | -63 (-254-239) | >0.20 | >0.20 | |
| Uses Hood Fan | 266.3 (147.0–416.3) | |||
| Does Not Use Hood Fan | 130.9 (98.7–442.7) | |||
| Outdoor PM2.5 Level (μg/m3) | 0.23 (-1.4–1.8) | >0.20 | >0.20 | |
| Uses Hood Fan | 7.60 (6.99–8.69) | |||
| Does Not Use Hood Fan | 8.10 (7.07–9.43) |
Summaries and results of Wilcoxon rank sum tests comparing four measures of household PM2.5 exposure as well as other covariates between those households that used the fan above the stove and those that did not. Significant results (p <0.05) are indicated with an asterisk (*).