Table 1. Descriptive statistics of the main confounders, classes of deprivation and classes of NO₂ air pollution for the Lille and Lyon MAs during the period 2002-2009.

		Lille MA (N=479 census blocks)		Lyon MA (N=491 census blocks)
		mean ± SD	[min; max]	mean ± SD	[min; max]
Classes of deprivation (tertiles)	Global	0.02± 1.01	[-1.93; 3.10]	-0.02± 0.99	[-2.04; 3.06]
	1st	-1.04± 0.28	[-1.93; -0.60]	-1.00± 0.42	[-2.04; -0.47]
	2nd	-0.12± 0.27	[-0.59; 0.38]	-0.13± 0.19	[-0.48; 0.20]
	3nd	1.19± 0.64	[0.39; 3.10]	1.06± 0.74	[0.20; 3.06]
Classes of NO₂ air pollution (tertiles)	Global	32.06± 5.31	[21.79; 58.16]	47.78±5.81	[29.49; 60.10]
	1st	26.53± 2.39	[21.79; 30.00]	34.88± 2.19	[29.49; 37.97]
	2nd	31.91± 1.05	[30.05; 33.82]	41.06± 1.76	[38.04; 43.73]
	3nd	37.75± 3.83	[33.84; 58.16]	47.78± 3.18	[43.73; 60.10]

Table 1. Descriptive statistics of the main confounders, classes of deprivation and classes of NO2 air pollution for the Lille and Lyon MAs during the period 2002-2009.