Table 3.
Multiple logistic regression analysis of factors associated with asthma among leather tannery workers, Karachi, Pakistan, August 2003 to March 2004 (n = 620†††)
| Variables | adjusted OR‡‡‡ | 95% CI |
| Educational Status | ||
| Literate | 1.00 | - |
| Illiterate | 2.13 | 1.17, 3.88 |
| Ethnicity | ||
| Punjabi | 1.00 | - |
| Pathan | 2.69 | 1.35, 5.36 |
| Others§§§ | 1.70 | 0.63, 4.58 |
| Smoking status | ||
| Non-smoker | 1.00 | - |
| Ever smoker | 2.22 | 1.16, 4.26 |
| Glove use | ||
| User**** | 1.00 | - |
| Non-user†††† | 3.28 | 1.72, 6.26 |
| Allergy‡‡‡‡ and duration of work§§§§ | ||
| Non-allergic | ||
| 8 years duration of work | 1.00 | - |
| 13 years duration of work | 0.99 | 0.73, 1.33 |
| Allergic | ||
| 8 years duration of work | 2.26 | 1.19, 4.29 |
| 13 years duration of work | 3.67 | 1.98, 6.79 |
†††The final model included less than 641 subjects due to missing values
‡‡‡ All variables are mutually adjusted for each other
§§§ Other ethnicity includes Urdu, Sindhi, Balochi and Brahvi
*** Worker who has at least rarely used gloves during different tanning tasks
†††† Worker who has never used gloves
‡‡‡‡ Perceived allergy to at least one of the following substances: food, metals, chemicals, medicine, dusts or animals
§§§§ The interaction was analyzed by calculating odds ratio relative to a common reference i.e. the duration of work at mean duration of 8 years and non-allergic status