Genotoxicity Study with Special Reference to Comet Test in the Blood Cells of Workers Exposed to Sewage Water

Table 3

Effects of years of exposure on blood Pb, Cd, Fe, and Zn level and DNA damage (TM = tail moment).

Factors	Control population (no exposure)	Workers, working <20 years,	Workers, working >20 years,
Blood Pb ± SD (mg/L)^**	0.132 ± 0.093^c	0.318 ± 0.12^b	0.47 ± 0.36^a
Blood Cd ± SD (mg/L)^**	0.0032 ± 0.004^c	0.0141 ± 0.004^b	0.02 ± 0.01^a
Blood Fe ± SD (mg/L)^**	1998.52 ± 52.66^c	1927.12 ± 74.04^b	1677.28 ± 99.94^a
Blood Zn ± SD (mg/L)^**	31.5 ± 1.8^c	26.61 ± 2.23^b	34.27 ± 2.74^a
DNA damage study (TM), M ± SD^**	1.37 ± 0.37^c	3.57 ± 0.84^b	5.69 ± 1.37^a

Values with different alphabets are statistically significant.