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Table 1 Criteria used to assess content validity strength and psychometric strength

From: Development of a preliminary conceptual model of the patient experience of chronic kidney disease: a targeted literature review and analysis

  Content validity strength Psychometric strength
Measures • Target patient indication
• Development process
– Literature reviews (concepts or instruments)
– Expert input/interviews
– Patient participation (concept elicitation and/or cognitive debriefing interviews)
• Internal consistency reliability [30]
Cronbach’s alpha > 0.7
• Reproducibility/test–retest reliability [31, 32]
ICC > 0.7
• Construct validity [33]
Correlation coefficients range from ≥ 0.3 to ≥ 0.6
• Minimum clinically important difference [34]
Value(s) reported for PRO instrument
• Ability to detect change
Demonstrated for PRO instrument
Scoring
Strong • Developed for target indication
• Development process with involvement of patients, literature reviews and clinician experts
• 4 or 5 psychometric properties meeting threshold values
Medium • Developed for target indication
• Development process lacking patient input
• 2 or 3 psychometric properties meeting threshold values
Weak • Not developed for target indication OR
• Just one type of input in the development process
• 0 or 1 psychometric properties meeting threshold values
  1. Threshold values for psychometric strength are shown in italics
  2. ICC intraclass correlation coefficient, PRO patient-reported outcome