Table 2. Prevalence of subjective symptoms by the subjects in the arsenic-affected and the arsenic-free village, Inner Mongolia.

	Arsenic-free village		Arsenic-affected village
	n=189		n=431
	No. of case	%	No. of case	%
Cough	10	5.3	151	35.0
Stomachache	24	12.7	189	43.9
Palpitation	7	3.7	51	11.8
Urination trouble	2	1.1	37	8.6
spontaneous abortion	4	4.0*	24	10.7*
Arthralgia	78	41.2	170	39.4

* Percentage is based on 99 and 224 female subjects in the arsenic-free and the arsenic-affected village