Figure 1From: Lead exposure study among workers in lead acid battery repair units of transport service enterprises, Addis Ababa, Ethiopia: a cross-sectional study Urinary ALA levels in exposed and unexposed subjects. urine samples collected from 51 exposed and 50 non-exposed persons were analyzed for levels of δ-ALA using double beam spectrophotometer. Inter-group analysis was performed using Student t-test. ***P < 0.001.Back to article page