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In early PET test-retest papers, signed (or raw) mean normalized test-retest differences were considered [16, 17], but later authors generally used the absolute values of the normalized differences instead [18].
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PTRT is obtained from mean normalized differences of test-retest samples.
In the present study, the mean of test-retest interval was of 2 years and 4 months which is similar to that in Ozonoff's study.
The mean test-retest values, absolute variability and ICC for SUVRWB are presented in Table 2.
The mean test-retest values, absolute variability and ICC for SUVRC are presented in Table 3.
The mean test-retest values, absolute variability and ICC for unadjusted SUV values are presented in Table 1.
The mean test-retest interval was 21.8 ± 16.7 days.
In Step 4, the Kappa test was used to evaluate agreement between mean test-retest scores for questionnaire items [ 16].
Reliability has been substantiated by means of test-retest correlations (r = 0.65-0.86) and Cronbach's alpha (median coefficient of 0.90).
The psychometric qualities of the questionnaire were verified by means of a test-retest study.
Zhang, Bansback, Kopec & Anis [ 23] assessed reliability over time by means of a test-retest analysis.
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