Table 3 . Distribution of serum TTG IgA according to the cut-off point of 20 .

Groups	Statistics	TTG		Total	x 2	P
		< 20 (Negative)	>=20 (Positive)
Control	f	580	20	600	28.42	0.001
	%	92.65	7.35
Case	f	391	44	402
	%	81.59	18.41
Total	f	883.00	118.00	1001
	%	88.21	11.79