Host and environmental predictors of exhaled breath temperature in the elderly

BMC Public Health

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.

ISSN: 1471-2458