Table 1. Proportion of insulin autoantibody (IAA)-positive mice in relation to age.

Age			P value
	GF	CONV-R
4 weeks	76.5% (n = 17)	38.9% (n = 18)	0.041
9 weeks	92.9% (n = 14)	61.9% (n = 21)	0.056
23 weeks	90% (n = 20)	75% (n = 16)	0.374

Analysis of serum samples of germ-free (GF) and conventionally raised (CONV-R) NOD mice. Data were analyzed by Fisher's exact test.