Table 4

Odds ratios for the risk factors for the presence of wheeze in the past year for non-atopic and atopic individuals

	Wheeze in the past year in non-atopics			Wheeze in the past year in atopics
	Adjusted* OR	95% CI	p value**	Adjusted* OR	95% CI	p value**	p value** (difference between atopics and non-atopics)
*Adjustment for all variables listed.
**Significance levels are based on a test for heterogeneity except for age and social class which are based on tests for trend using ordered categories.
***I=professional; II=managerial; IIInm=clerical; IIIm=skilled manual; IV=semi-skilled manual; V=unskilled manual.
Sex
Female	1	(reference)	0.460	1	(reference)	<0.001	<0.001
Male	1.04	0.93 to 1.17		0.76	0.67 to 0.86

Age
11–19	1	(reference)	<0.001	1	(reference)	0.129	<0.001
20–29	0.79	0.60 to 1.04		0.90	0.73 to 1.12
30–39	0.66	0.50 to 0.85		0.73	0.59 to 0.91
40–49	0.85	0.66 to 1.10		0.79	0.62 to 0.99
50–59	1.01	0.78 to 1.31		0.78	0.60 to 1.02
60–69	1.17	0.90 to 1.52		0.80	0.60 to 1.06
70–79	1.70	1.31 to 2.22		0.93	0.66 to 1.32
80–89	1.81	1.31 to 2.50		0.78	0.39 to 1.57
90+	2.49	1.07 to 5.81		0.36	0.04 to 3.16

Social class***
I	1	(reference)	<0.001	1	(reference)	0.759	<0.001
II	1.22	0.93 to 1.60		1.03	0.80 to 1.32
IIInm	1.20	0.89 to 1.61		1.02	0.76 to 1.35
IIIm	1.60	1.22 to 2.09		0.13	0.87 to 1.45
IV	1.68	1.26 to 2.23		1.03	0.77 to 1.37
V	1.67	1.18 to 2.34		0.93	0.63 to 1.36

Urban/rural
Rural	1	(reference)	0.010	1	(reference)	0.131	0.596
Urban	1.19	1.04 to 1.36		1.13	0.97 to 1.31

Smoking
Never	1	(reference)		1	(reference)
Ex	1.56	1.35 to 1.80	<0.001	1.29	1.09 to 1.53	0.004	0.095
Current	3.36	2.93 to 3.85	<0.001	1.64	1.41 to 1.90	<0.001	<0.001