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Table 4 Urinary δ-ALA (μg/ml) mean levels of exposed workers by employment duration.

From: Lead exposure study among workers in lead acid battery repair units of transport service enterprises, Addis Ababa, Ethiopia: a cross-sectional study

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