Table 4.

Criteria for Rating the Adequacy of the Reported Measurement Properties

Measurement Property	Reported Result	Quality Criteriaa
Reliability
1. Internal consistency	+	(Sub)scale unidimensional OR 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
	0	Did not assess internal consistency
2. 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
	0	Did not assess reliability
3. Measurement error	+	MIC > SDC OR MIC outside the LOA
	?	MIC not defined
	–	MIC ≤ SDC OR MIC equals or inside LOA
	0	Did not assess measurement error
Validity
4. 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 items in the questionnaire to be irrelevant OR considers the questionnaire to be incomplete
	0	Did not assess content validity
5. Structural validity	+	Factors should explain at least 50% of the variance
	?	Explained variance not mentioned
	–	Factors explain < 50% of the variance
	0	Did not assess structural validity
6. Construct validity (hypothesis testing)	+	Correlation with an instrument measuring the same construct ≥ 0.50 OR at least 75% of the results are 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 < 0.50 OR < 75% of the results are in accordance with the hypotheses OR correlation with related constructs is lower than with unrelated constructs
	0	Did not assess construct validity
7. Criterion validityb	+	Convincing arguments that gold standard is “gold” AND correlation with gold standard > 0.70
	?	No convincing arguments that gold standard is “gold” OR doubtful design or method
	–	Correlation with gold standard !0.70, despite adequate design and method
	0	Did not assess criterion validity
Responsiveness
8. Responsiveness	+	Correlation with an instrument measuring the same construct ≥ 0.50 OR at least 75% of the results are in accordance with the hypotheses OR AUC ≥ 0.70 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 < 0.50 OR < 75% of the results are in accordance with the hypotheses OR AUC < 0.70 OR correlation with related constructs is lower than with unrelated constructs
	0	Did not assess responsiveness

Abbreviations: AUC, area under the curve; ICC, intra‐class correlation coefficient; LOA, limits of agreement; MIC, minimal important change; SD, standard deviation; SDC, smallest detectable change.

^aThese criteria were adapted from Uijen et al.70 unless stated otherwise. The relevant criterion for cross‐cultural validity is not available from the current literature; this precluded rating the quality/adequacy of cross‐cultural validity property in the review.

^bAdapted from Terwee et al.81