Table 1.

Results of Intraclass Correlation Coefficient (ICC) tests: internal consistency (test-retest in the same day), stability (test-retest on different days)

Tests	experiments	rater A	rater B
test x re-test	1	0.994 (1)	0.945 (2)
test x re-test	2	0.986 (3)	0.969 (4)
test x test	1 × 2	0.949 (9)	0.877 (10)
re-test x re-test	1 × 2	0.904 (11)	0.808 (12)

Results are Cronbach´s Alpha for Intraclass Correlation Coefficient (ICC) tests. Numbers in the parenthesis are the sequence of tests following Fig. 2:

1: test-retest of rater A on Experiment 1;

2: test-retest of rater B on Experiment 1;

3: test-retest of rater A on Experiment 2;

4: test-retest of rater B on Experiment 2;

9: comparison of test results of rater A between Experiment 1 and Experiment 2;

10: comparison of re-test results of rater A between Experiment 1 and Experiment 2;

11: comparison of test results of rater B between Experiment 1 and Experiment 2;

12: comparison of re-test results of rater B between Experiment 1 and Experiment 2.