Table 3.

Heritability of intermediate asthma phenotypes in a sample of 575 Danish adult twins

	Heritability (%)
FEV1	68*
FVC	58*
FEV1/FVC	22
DRSmethacholine	43*
FeNO	67*
Serum total IgE	81*
Positive SPT	54*
HDM sensitization	6
Serum tryptase	82*

Serum tryptase was studied by Sverrild et al., 2013.

^*p<0.001. Modified from [III].