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Table 1 Quality Criteria for Measurement Properties (Terwee et al. 2007) [50]

From: Instruments to measure patient experience of healthcare quality in hospitals: a systematic review

Property Rating Quality criteria
Reliability   
 Internal consistency (+) (Sub)scale unidimensional AND Cronbach’s alpha(s) ≥0.70
? Dimensionality not known OR Cronbach’s alpha not determined
(−) (Sub)scale not unidimensional OR Cronbach’s alpha(s) <0.70
 Measurement error (+) MIC > SDC OR MIC outside the LOA
? MIC not defined
(−) MIC ≤ SDC OR MIC equals or inside LOA
 Reliability (+) ICC/weighted Kappa ≥0.70 OR Pearson’s r ≥ 0.80
? Neither ICC/weighted Kappa, nor Pearson’s r determined
(−) ICC/weighted Kappa <0.70 OR Pearson’s r < 0.80
Validity   
 Content validity (+) The target population considers all items in the questionnaire to be relevant AND considers the questionnaire to be complete
? No target population involvement
(−) The target population considers all items in the questionnaire to be irrelevant OR considers the questionnaire to be incomplete
 Construct validity   
 Structural validity (+) Factors should explain at least 50 % of the variance
? Explained variance not mentioned
(−) Factors explain <50 % of the variance
 Hypothesis testing (+) Correlation with an instrument measuring the same construct ≥50 % OR atleast 75 % of the results is in accordance with the hypotheses) AND correlation with related constructs is higher than with unrelated constructs
? Solely correlations determined with unrelated constructs
(−) Correlation with an instrument measuring the same construct <50 % OR <75 % of the results is in accordance with the hypotheses OR correlation with related constructs is lower than with unrelated constructs
  1. + positive, negative, ? indeterminate, AUC area under the curve, MIC minimal important change, ICC intraclass correlation, SDC smallest detectable change, LOA limits of agreement