Results of the univariate analysis showing the association of selected symptoms with the presence or absence of occupational asthma(OA)#
| Symptoms | OR (95% CI) | Sensitivity | Specificity | PPV | NPV | p-value |
| All subjects¶ | ||||||
| Wheezing at work | 3.8 (1.7–8.6) | 0.40 | 0.85 | 0.89 | 0.32 | 0.001 |
| Loss of voice at work | 0.47 (0.23–0.97) | 0.22 | 0.62 | 0.17 | 0.70 | 0.05 |
| Nasal itching at work | 2.64 (1.47–4.77) | 0.48 | 0.74 | 0.53 | 0.70 | 0.003 |
| Ocular itching at work | 1.82 (1.02–3.24) | 0.41 | 0.72 | 0.58 | 0.56 | 0.07 |
| Subjects exposed to high-molecular-weight agents+ | ||||||
| Wheezing at work | 8.5 (2.5–29.2) | 0.67 | 0.81 | 0.89 | 0.50 | 0.0006 |
| Loss of voice at work | 0.17 (0.05–0.64) | 0.20 | 0.39 | 0.08 | 0.65 | 0.01 |
| Improvement or disappearance of symptoms at weekends | 3.7 (1.05–13.5) | 0.76 | 0.54 | 0.41 | 0.8 | 0.06 |
| Improvement or disappearance of symptoms during vacations | 3.8 (1.3–11.3) | 0.74 | 0.57 | 0.57 | 0.74 | 0.03 |
| Nasal itching at work | 4.0 (1.5–10.6) | 0.68 | 0.65 | 0.68 | 0.65 | 0.01 |
OR: odds ratio; CI: confidence interval; PPV: positive predicted value; NPV: negative predicted value. #: the comparisons are between two groups, those with OA on the one hand and those (regrouped) with non-OA and neither OA nor non-OA on the other hand; ¶: n = 212; +: n = 71.