Table 3 Adjusted odds ratios for chronic obstructive pulmonary disease in the whole population considering three tested indicators of atopy

 Food allergens; ref.: no

2.71

1.23–6.46

0.0176

 Nasal allergies; ref.: no

2.17

1.34–3.56

0.0019

 Farmers; ref.: non-farmer

1.41

0.86–2.31

0.1725

 Age; continuous

1.02

0.99–1.05

0.1259

 Sex; ref.:female

1.06

0.61–1.84

0.8370

 Pack-years; ref. < 1

1

  1–15

1.13

0.60–2.13

0.7039

   > 15

1.69

0.98–2.92

0.0599

 Seasonal inhalant allergens; ref.: no

2.57

1.29–5.39

0.0091

 Nasal allergies; ref.: no

2.21

1.36–3.63

0.0015

 Farmers; ref.: non-farmer

1.57

0.96–2.60

0.0746

 Age; continuous

1.02

0.99–1.05

0.1681

 Sex; ref.:female

1.04

0.60–1.82

0.8861

 Pack-years; ref. < 1

1

  1–15

1.07

0.57–2.01

0.8352

   > 15

1.64

0.96–2.85

0.0737

 Polysensitized (at least 3 IgE); ref.: no

3.45

1.46–9.12

0.0073

 Nasal allergies; ref.: no

2.25

1.38–3.70

0.0011

 Farmers; ref.: non-farmer

1.44

0.89–2.37

0.1427

 Age; continuous

1.02

0.99–1.05

0.1081

 Sex; ref.:female

1.15

0.66–2.02

0.6178

 Pack-years; ref. < 1

1

  1–15

1.14

0.61–2.14

0.6849

   > 15

1.67

0.97–2.89

0.0669