Table 4.
Urinary δ-ALA (μg/ml) mean levels of exposed workers by employment duration.
| Employment duration | δ-ALA (μg/ml) ± SEM |
| ≤ 10 | 5.4 ±1.6 |
| 11–20 | 14.5 ± 3.1 |
| 21–25 | 19.0 ± 3.7 |
| 25+ | 23.4 ± 3.5 |
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