Table 1—

Descriptive data comparing subjects# included in the analyses with those who had to be excluded

IncludedExcluded
Subjects n15954358
Farm living during childhood**677 (42.5)1539 (35.6)
Female sex818 (51.3)2158 (49.5)
Age yrs**
 18–25249 (15.6)977 (22.4)
 26–30218 (13.7)595 (13.7)
 31–35339 (21.3)904 (20.7)
 36–40447 (28.0)1066 (24.5)
 41–44342 (21.4)816 (18.7)
Active and passive smoke exposure**
 Not at all508 (31.9)1199 (28.1)
 Only ETS206 (12.9)569 (13.3)
 Ex-smoker345 (21.6)856 (20.1)
 Current smoker536 (33.6)1640 (38.5)
Education >12 yrs399 (25.0)1064 (24.9)
Family history of allergic disease534 (33.5)1176 (31.4)
No. of siblings ≥3851 (53.4)2171 (51.2)
Wheezing without a cold**167 (10.5)564 (13.0)
Allergic rhinitis231 (14.5)569 (13.3)
Asthma diagnosis**79 (5.0)297 (6.9)
  • Data are presented as n (%), unless otherwise stated. ETS: environmental tobacco smoke. #: born in the former Western part of Germany (n = 5,953); **: p<0.01 (Chi-squared test).