Geometric means for percentage change in paired measures of PM2.5 and salivary cotinine
| Intervention | Average PM2.5 (μg/m3) | Maximum PM2.5 (μg/m3) | % of time over 35 μg/m3 | Salivary cotinine (ng/ml) | ||||
| Control | Enhanced | Control | Enhanced | Control | Enhanced | Control | Enhanced | |
| Number | 26 | 20 | 26 | 20 | 26 | 20 | 18 | 15 |
| GM | −3.6 | −30.7 | −23.1 | −44.8 | −50.4 | −82.4 | −14.4 | −28.6 |
| p Value | 0.229 | 0.261 | 0.198 | 0.577 | ||||
GM, geometric mean; p, the statistical significance of the difference between control and enhanced for each measure.