Table 1—

Basic characteristics of the subjects

Nonfarmers not living on a farmNonfarmers living on a farmFarmersp‐value
Subjects n21850198
Age yrs39.3 (38.6–40.1)41.4 (39.7–43.2)41.3 (40.5–42.1)0.001
BMI kg·m−225.2 (24.6–25.7)25.5 (24.5–26.5)25.6 (25.0–26.3)0.55
Skin-test positivity3635360.97
Smoking ever3416200.002
Length of education yrs12.9 (12.5–13.3)13.8 (13.0–14.5)13.0 (12.6–13.4)0.13
Having cats or dogs indoors currently344657<0.001
Parenteral atopy4134400.68
Number of older siblings1.7 (1.5–1.9)1.7 (1.1–2.2)2.0 (1.7–2.3)0.30
Childhood farming environment486271<0.001
Pets during childhood7265810.04
Passive smoking during childhood6958560.02
Allergic dermatitis during childhood2228220.64
Childhood daycare attendance3.
  • Data are presented as mean (95% confidence interval) or per cent, unless otherwise stated

  • The continuous variables were compared by analysis of variance between the groups

  • The categorical variables were compared between groups using the Chi-squared test

  • BMI: body mass index