Environmental exposure to arsenic may reduce human semen quality: associations derived from a Chinese cross-sectional study

Table 2 Differences in As species (geometric means ± SD) by demographic variables ^ª

	Urinary concentration (μg g^-1creatinine)
Variable	AsB	DMA	MMA	Asi	%DMA	%MMA	%Asi
All	7.49±24.8	20.9±13.7	2.77±3.33	4.03±3.67	73.4±8.44	9.73±4.65	14.2±6.88
25th	3.41	14.8	1.76	2.82	70.3	7.51	11.8
50th	6.63	20.7	2.59	3.81	75.4	10.1	14.2
75th	13.0	30.9	4.19	5.79	78.9	12.9	16.6
Smoker	6.91±25.9	18.7±11.9	2.22±3.45	3.61±3.75	73.6±9.88	8.72±4.37	14.2±8.17
Non-smoker	7.94±27.7	22.6±14.8	3.24±3.22	4.36±3.63	73.3±7.33	10.5±4.04	14.2±5.86
P-value	0.60	0.12	0.01** ^b	0.16	0.29	0.04*	0.94
Drinker	7.28±19.7	21.3±12.7	2.78±3.47	3.89±3.66	74.2±7.90	9.67±4.99	13.5±5.73
Non-drinker	7.82±34.8	20.3±15.3	2.76±3.15	4.25±3.74	72.3±9.19	9.82±4.17	15.1±8.21
P-value	0.85	0.67	0.96	0.51	0.55	0.83	0.34

^a The statistical difference was listed with P-value.
Proportion of each As species (%DMA, %MMA, and %Asi) were calculated by dividing their concentration by the total As metabolites in urine (the sum of DMA, MMA and Asi).
^b The comparison which the P-value applies are smoking habit and dinking habit, respectively, **Difference is significant at the 0.01 level; *Difference is significant at the 0.05 level.

ISSN: 1476-069X