Fig. 3From: Is atopy a risk indicator of chronic obstructive pulmonary disease in dairy farmers?Comparison of odds ratios for markers of atopy among dairy-farmers and non-dairy-farmers (reference groups are patients without chronic obstructive pulmonary disease (COPD). All ORs were adjusted for age (continuous), gender (reference: female) and pack-years (< 1, 1–15, > 15)Back to article page