Table 4.
Estimated difference in exhaled breath temperature (°C) associated with an 100% increase in distance and an interquartile range increase in traffic density
| Exposure (exposure contrasts) | Adjusted regression coefficients* | 95% CI | P-value | ||
|---|---|---|---|---|---|
| Distance: freeway, +100% |
-0.23°C |
-0.42 |
to |
-0.03 |
0.028 |
| Distance major road, +100% |
-0.18°C |
-0.35 |
to |
-0.001 |
0.050 |
| Distance major intense road, +100% |
-0.17°C |
-0.33 |
to |
-0.01 |
0.036 |
| Traffic density: 200-m buffer, +2 562 vehicles*km/day |
0.13°C |
-0.04 |
to |
0.30 |
0.14 |
| Traffic density: 300-m buffer, + 5 174 vehicles*km/day |
0.14°C |
-0.02 |
to |
0.31 |
0.084 |
| Traffic density: 500-m buffer, + 21 775 vehicles*km/day |
0.37°C |
0.06 |
to |
0.68 |
0.021 |
| Traffic density: 1000-m buffer, + 57 628 vehicles*km/day | 0.21°C | -0.16 | to | 0.59 | 0.26 |
*Adjusted for gender, age, physical activity, BMI, and daily average ambient temperature as identified in Table 3 in addition asthma and COPD were forced in the regression models.