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. 2015 Jan-Feb;20(1):e12–e20. doi: 10.1155/2015/159580
Quality Definition Criteria to rate the quality
Content validity The extent to which the domain of interest is comprehensively sampled by the items in the measure Face validity by participants and research team
Readability The questionnaire is understandable for all patients Completed questionnaire
Qualitative feedback
Internal consistency The extent to which items in a subscale are inter-correlated; a measure of the homogeneity of the subscale
  1. Factor analysis was applied in order to provide the dimensionality of the measure

  2. Cronbach’s alpha between 0.70 an 0.90 for each subscale <15% of the respondents achieved the highest or lowest possible score

Floor-ceiling effects The measure fails to demonstrate a worse score in patients who were clinically deteriorated and/or an improved score in patients who clinically improved
Responsiveness The ability to detect important change over time in the concept being measured Face evaluation by research team
Practicality considerations Burden to student and administration Time to complete
Ease of scoring