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Table 1 The interpretation of the psychometric properties

From: Comparison of content and psychometric properties for assessment tools used for brain tumor patients: a scoping review

Reliability
Internal reliability + Cronbach’s ɑ or ICC ≥ 0.70
Cronbach’s ɑ or ICC < 0.70
Test/retest method + ICC ≥ 0.70 or Pearson correlation coefficient/ Spearman rank correlation coefficient ≥ 0.80
- ICC < 0.70 or Pearson correlation coefficient/Spearman rank correlation coefficient < 0.80
Interrater reliability + ICC ≥ 0.70 or Pearson correlation coefficient/ Spearman rank correlation coefficient ≥ 0.80
ICC < 0.70 or Pearson correlation coefficient/Spearman rank correlation coefficient < 0.80
Validity
Content validity + The content of the assessment instrument is adequate, comprehensive, questions and tasks chosen to adequately reflect the content to be evaluated
- Not all selected questions and tasks reflect the content, content is not relevant, comprehensive
Criterion validity + Significant and stable relation between measurement and another instrument (r ≥ 0.70) or with start/end measurement
Poor measurement correlation with another instrument (r < 0.70) or start / end measurement
Structural validity + Correlation with instruments measuring the same ≥ 0.50 or correlation higher for unrelated elements in the instrument than for unrelated ones
- Correlation with instruments measuring the same < 0.50 or correlation with related elements in the instrument is lower than unrelated ones
Responsiveness
Responsiveness + Able to detect clinically significant changes over time
Cannot detect clinically significant changes over time
  1. Cronbach’s ɑ, Chronbach's ɑ coefficient; ICC, interclass correlation coefficient