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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