of borderline significancep = 0.05
Trisomy of chromosome 9 was significantly increased (p= 0.02) in the higher exposed workers (> 31 ppm), and an increase of borderline significance (p = 0.05) in tetrasomy 9 was also observed in this group.
Trisomy of chromosome 9 was significantly increased (p= 0.02) in the higher exposed workers (> 31 ppm), and an increase of borderline significance (p = 0.05) in tetrasomy 9 was also observed in this group.