Table 3 Distribution of current asthma treatment and social class by traffic exposure

Change in traffic exposure			Current treatment for asthma		Social class IIIN–V, unclassified
Change in traffic exposure			N (%)	p Value	N (%)	p Value
Nearest street to the home	Total traffic	<0	48 (14.0)	0.75	151 (45.2)	0.89
	Total traffic	⩾0	95 (13.3)	0.75	308 (44.8)	0.89
	HGV	<0	60 (16.1)	0.06	176 (49.3)	0.17
	HGV	⩾0	67 (11.8)	0.06	243 (44.6)	0.17
Nearest street within 100 m of the home	Total traffic	<0	32 (13.9)	0.56	115 (51.3)	0.15
	Total traffic	⩾0	56 (12.3)	0.56	202 (45.4)	0.15
	HGV	<0	38 (15.3)	0.14	119 (50.0)	0.70
	HGV	⩾0	38 (11.2)	0.14	162 (48.4)	0.70