Property | Rating | Quality criteria |
---|---|---|
Reliability | ||
Internal consistency | + | Cronbach’s alpha(s) ≥ 0.70 |
? | Dimensionality not known OR Cronbach’s alpha not determined | |
− | Cronbach’s alpha(s) < 0.70 | |
+ | 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 | + | All items are considered to be relevant for the construct to be measured, for the target population, and for the purpose of the measurement, AND the questionnaire is considered to be comprehensive |
? | Not enough information available | |
− | Not all items are considered to be relevant for the construct to be measured, for the target population, and for the purpose of the measurement, OR the questionnaire is considered not to be comprehensive | |
Construct validity | ||
Structural validity | + | Factors should explain at least 50% of the variance |
? | Explained variance not mentioned | |
− | Factors explain <50% of the variance | |
Structural validity (IRT methods applied) | + | Residual correlations among the items after controlling for the dominant factor <0.20 OR Q3′s < 0.37, item scalability >0.30, IRT model fit: G2 > 0.01, no DIF for important subject characteristics (such as age, gender, education): McFadden’s R2 < 0.02 |
? | Important characteristics not reported | |
− | Residual correlations among the items after controlling for the dominant factor ≥0.20 OR Q3′s ≥ 0.37, item scalability ≤0.30, IRT model fit: G2 ≤ 0.01, important DIF for important subject characteristics (such as age, gender, education): McFadden’s R2 ≥ 0.02 | |
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 | |
Cross-cultural validity | + | No differences in factor structure OR no important DIF between language versions |
? | Multiple group factor analysis not applied AND DIF not assessed | |
− | Differences in factor structure OR important DIF between language versions | |
Responsiveness | ||
Responsiveness | + | Correlation with changes on instruments measuring the same construct ≥0.50 OR at least 75% of the results are in accordance with the hypotheses OR AUC ≥ 0.70, AND correlations with changes in related constructs are higher than with unrelated constructs |
? | Solely correlations determined with unrelated constructs | |
− | Correlations with changes on instruments measuring the same construct <0.50, OR <75% of the results are in accordance with the hypotheses, OR AUC < 0.70, OR correlations with changes in related constructs are lower than with unrelated constructs | |
Interpretability | + | MIC calculated and anchor questions clearly described |
? | MIC calculated but anchor questions not clearly labelled | |
− | MIC not reported |