“…The comparisons of demographic data or SPT results between asthma and control groups were performed by conditional logistic regression and were reported as odds ratios (OR) with 95% confidence intervals. We formed four categories based on the number of SPTpositive reactions (0; 1-2; 3-5; [6][7][8][9][10][11][12][13][14][15][16][17]. Models between all skin prick test results and asthma were also tested for the following 14 potential confounding factors: smoking, allergic rhinitis, nasal polyps, education level, training, occupation field, childhood background in farm/countryside, previous/current exposure to dogs/cats, and parental asthma/allergy.…”