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Table 3 Quality criteria for measurement properties [Based on Terwee et al., [17]]

From: Measurement properties of translated versions of neck-specific questionnaires: 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 items in the questionnaire to be irrelevant

  

OR considers the questionnaire to be incomplete

Construct validity

  

- Cross-cultural validity

+

Original factor structure confirmed OR no important DIF

 

?

Confirmation original factor structure AND DIF not mentioned

 

-

Original factor structure not confirmed OR important DIF

- 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 ≥ 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

Responsiveness

  

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

  1. [..] = reference number, MIC = minimal important change, SDC = smallest detectable change, LOA = limits of agreement, ICC = intraclass correlation coefficient, DIF = differential item functioning, AUC = area under the curve
  2. † + = positive rating, ? = indeterminate rating, - = negative rating