Table 1: Correlations between atopy-related traits in a population of 1007 children, 7–17 years of age.

TraitTraits(1)Principal components(2)Summary statistics(3)
AsthmaHay feverEczemaIgEFEV1/FVCAHRSPTGrassCatHDMComp 1Comp 2Comp 3

Asthma10240.670.127.1 (5.7–8.9)
Hay fever0.2510.660.100.1717.3 (15.1–19.7)
Eczema0.100.1410.090.050.9022.1 (19.6–24.7)
IgE0.200.320.1710.500.220.3035.2 (31.8–39.1)
FEV1/FVC−0.16−0.05−0.01−0.0610.04−0.620.2089.4 (89.0–89.8)
AHR0.380.160.130.24−0.1810.110.740.2211.6 (9.7–13.7)
SPT0.230.460.120.39−0.050.2010.890.11−0.0521.8 (19.4–24.5)
 Grass0.130.430.110.30−− (6.2–9.5)
 Cat0.250.340.180.25− (5.1–8.2)
 HDM0.240.320.200.30−−0.1811.8 (10.0–14.0)

(1)Significant correlations are shown in bold print. Significance level is 0.0005 when adjusting for multiple testing.
(2)Varimax-rotated factor solution.
(3)IgE is geometric mean (95% CI); all other values are percentages (95% CI).
IgE is serum total IgE; AHR is airway hyperresponsiveness to histamine; SPT is positive skin prick test; HDM is house dust mite (D. Pteronyssinus).