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.

Fountoulakis et al. BMC Psychiatry 2003 3:2   doi:10.1186/1471-244X-3-2