Construct validity, floor and ceiling effects, data completeness and magnitude of change for the eight-item HAKIR questionnaire : a patient-reported outcome in the Swedish National Healthcare Quality Registry for hand surgery
Introduction: The aim of this study was to evaluate the construct validity, floor and ceiling effects, data completeness and magnitude of change over time for the eight-item patient questionnaire (HQ-8) in the Swedish Healthcare Quality Registry for hand surgery (HAKIR). Methods: Construct validity was investigated through predefined hypotheses and correlation statistics between the single items i
