Descriptive characteristics of a sample of 575 Danish twins, 20–51 years of age.
N (%)
Demographic data
Age
35.9 (8.2)
Males
240 (41.7)
Females
335 (58.3)
MZ twins
191 (33.2)
DZ twins
384 (66.8)
BMI
25.3 (4.6)
Smoking ever
262 (45.6)
Clinical traits
Urticaria ever
151 (26.3)
Urticaria in the past 12 months
24 (4.2)
Urticaria currently
0 (0)
Asthma
337 (58.6)
Hay fever
309 (53.7)
Atopic dermatitis
137 (23.8)
Paraclinical traits
Positive skin prick test
318 (55.3)
Serum total IgE
54.4 (4.3)
MZ: monozygotic; DZ: dizygotic; BMI: body mass index. All numbers are prevalence (%) except age (years, mean); BMI (kg/m2, mean); and serum total IgE (KIU/L, geometric mean).