Table 2.

Distribution of estimated annual average air pollution levels at the participants’ home addresses at the beginning of the 2005/2006 cycle for all study participants ($N=\mathrm{1,762}$).

Pollutant	$\text{Mean}\pm \text{SD}$	Min	Median	Max	IQR
${\text{NO}}_2$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)	$23.7\pm 7.1$	11.3	22.1	59.6	8.9
${\text{NO}}_{\mathrm{x}}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)	$35.6\pm 12.6$	18.5	31.8	93.3	13.5
${\mathrm{PM}}_{2.5}$ abs (${10}^{-5}/\mathrm{m}$)	$1.24\pm 0.26$	0.86	1.19	2.60	0.31
${\mathrm{PM}}_{2.5}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)	$16.4\pm 0.8$	15.0	16.1	19.8	1.4
${\mathrm{PM}}_{10}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)	$25.0\pm 1.6$	23.7	24.5	32.2	1.5
${\mathrm{PM}}_{\text{coarse}}$ (${\mathrm{\mu }\mathrm{g}/\mathrm{m}}^3$)	$8.5\pm 1.0$	7.6	8.0	13.3	0.8

Note: IQR: interquartile range; max, maximum; min, minimum.