Table 1.

Cytotoxicity and cell viability in human lymphocytes cultures maintained 24 h in the presence of COP

Concentrations (mg/L)	LDH assay (% cytotoxicity)	MTT assay (% cell viability)
Control	12.8 ± 4.4a	99.5 ± 8.3a
10	14.5 ± 5.1b	88.4 ± 8.1b
25	14.1 ± 5.9b	88.9 ± 8.6b
50	17.6 ± 5.4c	89.3 ± 7.1b
100	17.3 ± 4.8c	81.4 ± 7.7c
200	36.4 ± 5.6d	47.3 ± 5.3d
400	41.8 ± 5.4d	46.4 ± 4.8d

Values are means ± SD; means in the same column followed by the different superscript letters present significant statistical differences at the level of 0.05