Table 1. LacZ mutant frequency in sperm collected 42 days after a 28-day exposure to benzo(a)pyrene, and clonal correction.

Dose (mg/kg bw/day)	Animal ID	Raw data				Clonality		Clonal correction
		MF × 10−5	Average MF × 10−5	SD	Fold change	% clonality	Average % clonality	Corrected MF × 10−5	Average MF × 10−5	SD	Fold change
0	1	1.6	3.9	1.8 (46.2%)	—	56.8	41.0	0.7	2.3	1.2 (52.2%)	—
	2	4.6				14.3		3.9
	3	4.7				58.5		2.0
	4	2.5				40.6		1.5
	5	3.3				26.8		2.4
	6	6.7				49		3.4
100	7	13.4	13.1	3.4 (26.0%)	3.4	27.8	24.8	9.7	9.5	1.0 (10.5%)	4.1
	8	13.3				35.2		8.6
	9	11.2				17.2		9.3
	10	9.2				4.8		8.8
	11	18.4				39.1		11.2

MF: mutant frequency.

SD: standard deviation.