Table 2.

Distance from a Major Roadway (in Quartiles) and Plasma Cytokine Levels in Study Participants (n = 577)

Log10 (pg/mL) selected cytokine level	Quartile 1 (<172 m), n = 131	Quartile 2 (172–220 m), n = 161	Quartile 3 (221–496 m), n = 151	Quartile 4 (>496 m), n = 134	P for trend
IL 1β	−0.07 (0.42)	−0.19 (0.62)	−0.10 (0.57)	−0.21 (0.56)	0.15
IL 4	0.58 (0.93)	0.71 (0.89)	0.35 (0.97)	0.46 (0.96)	0.04
IL 6	0.83 (0.46)	0.79 (0.56)	0.72 (0.58)	0.71 (0.59)	0.04
IL 10	0.67 (1.01)	0.64 (1.04)	0.54 (0.97)	0.41 (1.04)	0.03
IL 17A	0.70 (0.84)	0.48 (0.91)	0.75 (0.80)	0.59 (0.81)	0.98
IL 17F	0.99 (1.06)	1.23 (0.96)	0.74 (1.08)	0.82 (1.09)	0.01
IL 21	0.64 (0.77)	0.58 (0.78)	0.57 (0.74)	0.47 (0.70)	0.06
IL 22	0.41 (0.91)	0.25 (0.96)	0.45 (0.93)	0.30 (0.93)	0.80
IL 23	0.09 (0.59)	−0.01 (0.39)	0.15 (0.62)	0.09 (0.57)	0.37
IL 25	0.66 (0.32)	0.66 (0.46)	0.60 (0.37)	0.58 (0.42)	0.06
IL 31	1.32 (0.87)	1.49 (0.80)	1.17 (1.00)	1.11 (1.02)	0.004
IL 33	1.75 (0.60)	1.58 (0.84)	1.76 (0.53)	1.61 (0.76)	0.49
IFN γ	0.79 (1.08)	1.02 (1.10)	0.59 (1.12)	0.69 (1.10)	0.07
TNFα	0.85 (0.23)	0.84 (0.23)	0.83 (0.23)	0.80 (0.27)	0.13

Results presented as mean (SD).

P value for trend obtained using unadjusted ordinal regression.