Evaluation in vinyl chloride monomer (VCM)-exposed workers and the relationship between liver lesions and gene polymorphisms of metabolic enzymes

Table 2 Prevalence of symptoms and signs among VCM-exposed workers stratified by VCM exposure

Symptoms and signs	VCM exposure
	≤ 15 000 mg		> 15 000 mg		Total
	(n = 186)		(n = 52)		(n = 238)
Neurastheniaa	26	14.00%	14	26.92%	40	16.81%
Respiratory system	3	1.60%	1	1.92%	4	1.68%
Digestive system	4	2.15%	1	1.92%	5	2.10%
Pharyngitisa	104	55.90%	34	65.38%	138	57.98%
ECG	19	10.20%	5	9.61%	24	10.08%
Nephridium USG	1	0.53%	2	3.85%	3	1.26%
Gall bladder USG	4	2.15%	4	7.69%	8	3.36%
Liver USGa	34	18.30%	17	32.69%	51	21.43%
Fatty liver	7	3.76%	3	5.77%	10	4.20%
Hepatic hemangioma	1	0.53%	2	3.85%	3	1.26%
Splenomegaly	8	4.30%	2	3.85%	10	7.08%

^aP < 0.05 vs ≤ 15 000 mg group.