The mean of BLLs in children was more likely in Ban Thi, as compared to tan Long (15, 42 ± 6, 45 µg / dl in comparision with 13, 47 ± 11, 48 µg / dl, p < 0.05), and the mean in total was 14, 41 ± 9, 42 µg / dl (table 3.3).