Table 2. Frequency of anti-GAD (glutamic acid decarboxylase) autoantibodies in patients with type 1 diabetes mellitus (DM1) diagnosed more than three years previously.

	GAD-positive	GAD-negative	P*
DM1	63.8% (37/58)	36.2% (21/58)	< 0.05
Control group	0 (0/51)	100% (51/51)	-

^*Chi-square test.