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Levels of urinary δ-ALA by age group
| Age | δ-ALA (μg/ml) ± SEM | |
| Non-Exposed | Exposed | |
| 20–35 | 7.3 ± 2.2 | 6.1 ± 2.2*** |
| 36–45 | 6.7 ± 1.2 | 12.4 ± 3.2*** |
| 46+ | 6.8 ± 1.4 | 21.7 ± 2.5*** |
Urinary ALA levels determined as described in the legend of Fig. 1 were compared between similar age groups of exposed and non-exposed subjects. Data were analyzed using F-ANOVA. ***P < 0.001.
