Table 4.

Adjusted difference in PSS score* per interquartile range increase in moving average PM _2.5 and BC exposure as predicted from spatio-temporal models

	PM 2.5			BC
	Pooled	Warm season (Apr-Sep)	Cold season (Mar-Oct)	Pooled	Warm season (Apr-Sep)	Cold season (Mar-Oct)
Moving average	β (95% CI)	β (95% CI)	β (95% CI)	β (95% CI)	β (95% CI)	β (95% CI)
1-week	0.80 (0.15, 1.44)	0.43 (-0.43, 1.29)	1.34 (0.38, 2.30)	0.32 (-0.04, 0.68)	0.03 (-0.55, 0.62)	0.48 (0.03, 0.92)
2-week	1.07 (0.43, 1.71)	0.56 (-0.33, 1.46)	1.78 (0.83, 2.74)	0.28 (-0.09, 0.64)	0.04 (-0.53, 0.62)	0.41 (-0.04, 0.86)
4-week	0.96 (0.41, 1.51)	0.31 (-0.47, 1.08)	1.79 (0.93, 2.65)	0.30 (-0.06, 0.67)	0.06 (-0.51, 0.62)	0.46 (-0.00, 0.92)

Abbreviations: PSS 14-item Perceived Stress Scale, PM _2.5 particulate matter with an aerodynamic diameter of <2.5 μm, BC black carbon.

^*As estimated in linear mixed effect regression with random intercept for participant adjusting for seasonality, weekday of visit, 24-hour mean apparent temperature, age, race, years of education, use of anti-depressant medication, and physical activity; associations for warm and cold months are estimated from interactions between warm/cold season and moving average exposure.