Table 1

Asthma diagnosis and symptom prevalence across deprivation quintiles

	Deprivation quintile
	1 (least)	2	3	4	5 (most)	χ²for trend
Figures given as number/denominator (%).
*Defined by the presence of one or more of the following reported symptoms, irrespective of diagnostic label: wheeze attacks >3/year; nocturnal wheeze or cough at least once a week; cough and/or wheeze symptoms “most times” with exertion.
**Defined as significant asthma symptoms in the absence of a current asthma diagnosis.
Asthma ever	290/1090 (26.4%)	274/936 (29.4%)	241/753 (31.9%)	277/825 (33.5%)	230/711 (32.0%)	10.9 (p<0.001)
Odds ratio (95% CI)	1	1.14 (0.94 to 1.39)	1.30 (1.06 to 1.59)	1.39 (1.15 to 1.70)	1.32 (1.07 to 1.62)

Current asthma	110/1090 (10.0%)	120/935 (12.7%)	108/756 (14.4%)	134/821 (16.2%)	111/709 (15.4%)	16.9 (p<0.001)
Odds ratio (95% CI)	1	1.31 (1.00 to 1.73)	1.49 (1.12 to 1.97)	1.74 (1.33 to 2.28)	1.65 (1.25 to 2.19)

Wheeze ever	362/1093 (33.0%)	338/936 (36.4%)	289/754 (38.6%)	317/825 (38.7%)	269/708 (38.1%)	7.1 (p<0.01)
Odds ratio (95% CI)	1	1.14 (0.95 to 1.37)	1.26 (1.03 to 1.52)	1.26 (1.04 to 1.52)	1.24 (1.02 to 1.51)

Wheeze in previous 12 months	172/1091 (15.6%)	182/936 (19.6%)	178/753 (23.9%)	169/823 (20.7%)	170/708 (24.3%)	19.9 (p<0.001)
Odds ratio (95% CI)	1	1.29 (1.03 to 1.62)	1.65 (1.31 to 2.10)	1.38 (1.09 to 1.75)	1.69 (1.33 to 2.14)

“Significant asthma symptoms”*	102/1098 (9.3%)	116/942 (12.3%)	138/761 (18.1%)	153/833 (18.4%)	140/709 (19.7%)	38.7 (p<0.001)
Odds ratio (95% CI)	1	1.37 (1.04 to 1.82)	2.16 (1.64 to 2.85)	2.20 (1.68 to 2.88)	2.40 (1.83 to 3.16)

Undiagnosed asthma**	35/1090 (3.2%)	40/935 (4.3%)	55/756 (7.3%)	60/821 (7.3%)	64/709 (9.0%)	30.6 (p<0.001)
Odds ratio (95% CI)	1	1.35 (0.85 to 2.14)	2.37 (1.53 to 3.65)	2.38 (1.55 to 3.64)	2.99 (1.96 to 4.57)