Table 1. Chromosome bands most affected by spontaneous breakage in exposed and non-exposed individuals six years after oil exposure.

	Exposed individuals	Non-Exposed individuals
Individuals	47	22
Total breakpoints identified by G-banding	251	110
Chromosome lesions	149	63
Structural chromosome alterations	102	47
Statistical methods used
Fragile site multinomial (FSM method)	1q32(5), 5q31(5), 6p21.2 (4), 7q22(4), 8p23(4), 9q22(4), 14q24(6), 17p11.2(5), 17q21(11), Xq22 (4)	3p21 (3), 10p13(3), 11q13(4), 14q24 (3), 17q21(4)
Statistical method using relative length of chromosome bands	1q22(1), 1q32(5), 2q13(2), 2q21(3), 2q23(2), 2q34(2), 2q35(2), 3q25(3), 3q27(3), 4p15.2(2), 5q31(5), 6p11.2(1), 6p21.2(4), 6q21(3), 7p15(3), 7q22(4), 7q32(3), 8p23(4), 8q21.2(2), 9p22(2), 9q13(3), 9q22(4), 9q32(2), 12p12(3), 12p13.1(2), 14q24(6), 16p13.1(2), 17p11.2(5), 17p12(2), 17q21(11), 18p11.2(3), 19p13.2(2), Xq13(3), Xq22(4), Xq24(2)	1p13(2), 1q21(2), 2p14(1), 2q11.2(2), 2q32(2), 3p21(3), 3q13.2(1), 4p16(2), 4q31.3(1), 4q33(1), 5p12(1), 5q22(2), 6p21.2(2), 6q25(2), 7p15(2), 9q13(2), 10p13(3), 10q22(2), 11p11((2), 11p14(2), 11q13(4), 12p13.1(1), 14q24(3), 15q23(1),16q13(2), 17p11.2(2), 17q12(1), 17q21(4)

Numbers in parentheses indicate the breaks located in chromosome band. Bold chromosome bands are present only in exposed individuals using two statistical methods.