Table 1.

Descriptive statistics showing the exposures, outcomes, and covariates: Metropolitan Vancouver resident cohort, 45–85 y old (1994–1998), $n=\mathrm{380,738}$.

Category	$n=\mathrm{380,738}$	Mean or %	IQR	Range
Exposures
Transportation noise Lden (dBA)		63.4	6.8	$<45–98.5$
Transportation noise Lden (dBA) lowest decile	36,685	9.6%	-	$\le 57$
Transportation noise Lden (dBA) 2nd–5th deciles	154,796	40.6%	-	58–61
Transportation noise Lden (dBA) 6th–9th deciles	151,989	39.9%	-	62–69
Transportation noise Lden (dBA) 10th decile	37,268	9.9%	-	$\ge 70$
${\text{NO}}_2$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)		32.1	8.4	14.4 – 57.8
NO (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)		32.0	13.13	8.8–126.0
${\text{PM}}_{2.5}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)		4.1	1.6	0 – 10.2
Black carbon (${10}^{-5}/\mathrm{m}$)		1.5	0.9	0 – 5.0
Greenness (NDVI Index) $100\mathrm{m}$		0.32	0.12	$-0.08–0.6$
Neighborhood Walkability Index		0.31	4.3	$-7.7–13.4$
Outcomes
Incident diabetes cases over 4 years	12,941	3.4%
Covariates
Age (years)		58	17	45–83
Male	175,219	46.0%
Quintiles of area level household income from census
Income: 0	55,626	14.6%
Income: 1	65,567	17.2%
Income: 2	73,602	19.3%
Income: 3	84,426	22.2%
Income: 4	101,517	26.7%
$>10\%$ South Asian population in neighborhood	74,911	19.6%
$>10\%$ Chinese population in neighborhood	183,044	48.1%

Note: dBA, A-weighted decibels; IQR, interquartile range; Lden, annual average noise exposure; NDVI, Normalized Difference Vegetation Index; NO, nitric oxide; ${\mathrm{NO}}_2$, nitrogen dioxide; ${\mathrm{PM}}_{2.5}$, particulate matter with aerodynamic diameter $<2.5\mathrm{\mu }\text{m}$.