Table 6

Final multiple regression model of relation of slope to specific IgE and other factors for 757 subjects

Factor	Mean difference from reference group or regression coefficient	95% confidence interval	p value
Total IgE (log₁₀kU/l)	−0.13	−0.34 to 0.08	0.23
Specific IgE to:
Cat	−0.59	−1.09 to −0.08	0.02
D pteronyssinus (just positive)	−0.72	−1.07 to −0.37	<0.001
per 10 kU/l increase above 0.35	−0.22	−0.39 to −0.05	0.01
Timothy grass	−0.50	−0.84 to −0.15	0.005
Cladosporium	−1.44	−2.24 to −0.64	<0.001
Birch	0.49	−0.08 to 1.06	0.09
(FEV₁ - predicted)/RSD	0.37	0.21 to 0.53	<0.001
FEV₁%FVC	0.09	0.07 to 0.12	<0.001
Per 10 cm of height	0.36	0.16 to 0.55	<0.001
Females - males	−0.75	−1.12 to −0.38	<0.001
Centre:			<0.001
Ipswich-Cambridge	0.55	0.20 to 0.89
Norwich-Cambridge	1.11	0.76 to 1.46
Parental atopy	−0.23	−0.50 to 0.04	0.10
Season of testing:			0.04
Spring-winter	0.31	−0.08 to 0.69
Summer-winter	0.02	−0.35 to 0.39
Autumn-winter	−0.22	−0.68 to 0.23
Number of siblings			0.08
1 - none	0.09	−0.39 to 0.57
2 - none	0.44	−0.04 to 0.92
3 - none	0.13	−0.40 to 0.66
4 - none	0.47	−0.06 to 0.99
Smoking: difference at age 20 from Non-smoker
Ex-smoker	0.54	−0.24 to 1.32	0.18
Current smoker	0.74	0.08 to 1.40	0.03
Age/smoking: increase per 10 years of age in
Non-smokers	0.53	0.27 to 0.80	<0.001
Ex-smokers	0.10	−0.31 to 0.51	0.64
Smokers	−0.16	−0.54 to 0.21	0.39