Multivariate analysis for predictors of obstructive pattern* of spirometry among male textile workers (n=372), Karachi, Pakistan
| n | ||||
|---|---|---|---|---|
| Variable | Obstructive pattern | No obstructive pattern | AOR | 95% CI |
| Pack-years of smoking | ||||
| Non-smoker | 15 | 200 | 1 | – |
| Less than 10 years | 10 | 120 | 1.0 | (0.4 to 2.4) |
| More than 10 years | 7 | 20 | 2.4 | (0.8 to 7.7) |
| Duration of work | ||||
| Less than 5 years | 7 | 111 | 1 | – |
| 6–10 years | 6 | 126 | 0.8 | (0.2 to 2.5) |
| 11 years or more | 19 | 103 | 2.6 | (0.9 to 6.9) |
| Section of mill | ||||
| Weaving | 13 | 185 | 1 | – |
| Spinning | 19 | 155 | 2.5 | (1.0 to 6.2) |
| Socioeconomic status† | ||||
| High | 5 | 88 | 1 | – |
| Low | 5 | 89 | 0.8 | (0.2 to 3.1) |
| Lower | 13 | 79 | 2.7 | (0.8 to 8.3) |
| Least | 9 | 84 | 1.8 | (0.5 to 5.9) |
| Ethnicity | ||||
| Punjabi | 12 | 91 | 1 | – |
| Sindhi | 10 | 106 | 0.5 | (0.1 to 1.5) |
| Others | 10 | 143 | 0.5 | (0.2 to 1.2) |
Marital status, mill cluster, household income per person and educational status were excluded as they became non-significant in the final multivariate model.
*Obstructive pattern: percentage-predicted FEV1/FVC<0.7, percentage-predicted FEV1<80%.
†Calculated by dividing the monthly household income in Pakistani rupees (Rs) (US$1=90 Rs) by number of household members. The continuous variable was later categorised into quartiles based on monthly household income per household member, where high >Rs: 2553, low=Rs: 1714–2553, lower=Rs: 1157–1714, and least <Rs: 1157.
FEV1, Forced Expiratory Volume in the first second; FVC: Forced Vital Capacity.