. Author manuscript; available in PMC: 2012 Oct 1.

Published in final edited form as: J Allergy Clin Immunol. 2011 Aug 15;128(4):774–779. doi: 10.1016/j.jaci.2011.06.046

Table IV.

Multivariate analysis of risk factors for asthma in 1996–1997 and 2006–2009. Only covariates close to the significance threshold (P-value <0.05) are listed.

	1996 – 1997

Covariates	Estimate (SE)	O.R. (95% C.I.)	P-val
Constant	−3.45 (0.83)		<0.001
Sex	−0.97 (0.51)	0.38 (0.14, 1.03)	0.056
No. Older Siblings	−0.18 (0.09)	0.83 (0.71, 0.98)	0.033
Genetic Component^†	2.58 (0.58)		<0.001

	2006 – 2009

Covariates	Estimate (SE)	O.R. (95% C.I.)	P-val

Constant	−6.82 (1.62)		<0.001
Age	−0.08 (0.03)	0.92 (0.87, 0.98)	0.004
Atopy^††	2.22 (0.73)	9.22 (2.19, 38.85)	0.003
Genetic Component^†	3.79 (0.84)		<0.001

^†

The genetic component is an estimate of the variability in asthma risk that can be attributed to genetics.

^††

Atopy is defined a positive skin prick test response to any of 13 tested aero-allergens (see Methods).