Table 5.

ANOVA results.

	Sums of Squares	Percent of Total variance	Df	Mean Square
subjects	2069.09	10.67	17	121.71
MDI items	11275.05	58.13	12	939.59
Test vs. retest (trials)	1.68	0.01	1	1.68
subjects by items	5631.18	29.03	204	27.60
subjects by trials	103.86	0.54	17	6.11
items by trials	8.38	0.04	12	0.70
subjects by items by trials	307.08	1.58	204	1.51
Total	19396.32	100.00	467	41.53

They suggest that only 0.01% of total variance is due to differences inherent to the test-retest procedure, with an additional 2.16% (0.54+0.04+1.58) attributable to the interaction of this procedure with subjects and the test itself. This is obviously a very low rate.