Characteristics n (%)
Sex [female] § 1257 (48.9)
Family socioeconomic status §
Low or medium
1889 (73.9)
High
667 (26.1)
Maternal smoking during pregnancy §
Yes
364 (14.2)
No
2199 (85.8)
Second-hand smoke exposure during pregnancy §
Yes
101 (5.11)
No
1874 (94.9)
Allergic rhinitis up to 6 years of age 165 (6.4)
Mean age at the onset
5.7 (0.97)
Allergic rhinitis up to 12 years of age 473 (18.4)
Mean age at the onset 9.8 (3.1)
Allergic rhinitis up to 27 years of age 668 (26.0)
Mean age at the onset
14.7 (7.8)