Table 3.

Generalized linear model results testing the association between bike route type and pollution levels with and without adjusting for traffic density, background levels, intersections and vegetation density.

Parameter	BC (ng/m3)		NO2 (ppb)
	β	p-valuea	β	p-value
Unadjusted
Bike Path (Reference)	0	NA	0	NA
Bike Lane	682.3	<0.0001	4.80	<0.0001
Designated Bike Lane	305.2	0.569	9.46	<0.0001
Intercept	1673	<0.0001	14.74	<0.0001
Traffic, Background Concentration and Intersections
Bike Path (Reference)	0	NA	0	NA
Bike Lane	580.1	0.0019	4.33	<0.0001
Designated Bike Lane	118.8	0.831	8.98	<0.0001
Traffic Density	−0.017	0.206	−8.1×10−5	0.153
Background Concentration	0.095	0.700	0.684	<0.0001
At Intersection	−62.43	0.670	1.42	0.020
Intercept	1876	<0.0001	4.18	<0.0001
Traffic, Background Concentration, Intersections and Vegetation Density
Bike Path (Reference)	0	NA	0	NA
Bike Lane	521.3	0.020	1.77	0.117
Designated Bike Lane	52.74	0.927	6.33	0.0052
Traffic Density	−0.018	0.188	−1.2×10−4	0.040
Background Concentration	0.101	0.685	0.668	<0.0001
At Intersection	−76.32	0.610	1.07	0.083
Vegetation Density	−55.77	0.638	−1.73	0.0008
Intercept	1946	<0.0001	7.42	0.0001

^aThe probability that the estimate equals zero