. Author manuscript; available in PMC: 2013 Jan 1.

Published in final edited form as: Int J Hyg Environ Health. 2012 Mar 17;216(1):76–81. doi: 10.1016/j.ijheh.2012.02.008

Table 2.

Differences in micronucleus (MN) frequency by VCM exposure.

CED (mg/m³)	Number	MN Freq ± SE (‰)	FR (95%CI)
Control	30	1.60 ± 1.30	1
Exposure	317	3.47 ± 2.65^**	2.31(1.81–3.01)
0~	76	3.16 ± 2.50^**	2.07(1.61–2.83)
0.48~	71	2.68 ± 2.31^**	1.80(1.36–2.41)
1.13~	87	3.62 ± 2.65^**	2.43(1.86–3.23)
6.36~	83	4.29 ± 2.84^**	2.88(2.21–3.82)

MN, micronuclei; FR, frequency ratio, compare with pooled unexposed and control group MN; VCM, vinyl chloride monomer; ‰, per thousand lymphocytes; SD, standard deviation; CED, cumulative exposure dose, VCM exposed subjects were divided into four groups with quarte cumulative doses.

^**

Compare with control group P < 0.01.