Table 3.
Ratings of each EMPRO item and attribute for every quality of life instrument identified.
| Attributes | HIT- 6a | EQ-5Da | VASa | FACIT-Fa | SF-36a |
|---|---|---|---|---|---|
| Conceptual and measurement model | 52.38 | 85.71 | 80.95 | 42.86 | 71.43 |
| Concept of measurement stated | ++++ | ++++ | ++++ | ++++ | ++++ |
| Obtaining and combining items described | ++++ | ++++ | ++++ | ++ | ++++ |
| Rationality for dimensionality and scales | + | ++++ | ++++ | + | ++++ |
| Involvement of target population | ++++ | ++++ | — | +++ | — |
| Scale variability described and adequate | + | +++ | ++++ | ++ | +++ |
| Level of measurement described | + | ++++ | +++ | + | +++ |
| Procedures for deriving scores | ++++ | +++ | ++++ | +++ | ++++ |
| Reliability | 62.50 | 62.50 | 66.67 | 25.00 | 66.67 |
| Data collection methods described | ++++ | ++++ | ++++ | ++ | ++++ |
| Cronbach’s alpha adequate | + | + | ++++ | ++ | +++ |
| Item Response Theory (IRT) estimates provided | +++ | ++++ | — | — | — |
| Testing in different populations | ++++ | — | — | — | ++++ |
| Data collection methods described | +++ | ++++ | +++ | ++ | ++++ |
| Test–retest and time interval adequate | +++ | +++ | +++ | ++ | +++ |
| Reproducibility coefficients adequate | + | ++ | ++ | ++ | ++ |
| IRT estimates provided | +++ | +++ | +++ | — | — |
| Validity | 44.44 | 63.89 | 83.33 | 54.17 | 76.67 |
| Content validity adequate | + | ++ | ++++ | +++ | + |
| Construct/criterion validity adequate | ++++ | ++++ | ++++ | +++ | ++++ |
| Sample composition described | ++++ | ++ | ++++ | ++ | ++++ |
| Prior hypothesis stated | + | ++ | +++ | +++ | +++ |
| Rational for criterion validity | + | +++ | N/A | N/A | N/A |
| Tested in different populations | ++++ | ++++ | N/A | N/A | ++++ |
| Responsiveness | 66.67 | 100.00 | 77.78 | 55.56 | 55.56 |
| Adequacy of methods | ++++ | ++++ | ++++ | +++ | +++ |
| Description of estimated magnitude of change | +++ | ++++ | ++++ | +++ | +++ |
| Comparison of stable and unstable groups | ++ | ++++ | ++ | ++ | ++ |
| Interpretability | 77.78 | 61.11 | 66.67 | 77.78 | 44.44 |
| Rational of external criteria | +++ | ++++ | ++++ | +++ | +++ |
| Description of interpretation strategies | ++++ | ++ | +++ | ++++ | +++ |
| How data should be reported stated | +++ | ++ | ++ | ++++ | + |
| Burden | 45.24 | 54.76 | 59.52 | 23.81 | 42.86 |
| Skills and time needed | +++ | +++ | +++ | ++ | + |
| Impact on respondents | +++ | +++ | ++ | ++ | ++++ |
| Not suitable circumstances | +++ | ++++ | + | ++ | + |
| Resources required | +++ | +++ | +++ | +++ | ++++ |
| Time required | — | — | +++ | — | — |
| Training and expertise needed | — | — | ++++ | — | — |
| Burden of score calculation | ++ | ++++ | ++++ | + | ++++ |
| Alternative modes of administration | — | 75.00 | — | 16.67 | 41.67 |
| Metric characteristics of alternative forms | — | +++ | — | + | ++ |
| Comparability of alternative forms | — | +++ | — | ++ | +++ |
| Cultural and language adaptations or translations | — | 100.00 | 100.00 | 27.78 | 83.33 |
| Linguistic equivalence | — | ++++ | ++++ | ++ | ++++ |
| Conceptual equivalence | — | ++++ | ++++ | ++ | ++++ |
| Significant differences | — | ++++ | ++++ | + | +++ |
| Global score (Panoramic) | 59.09 | 73.81 | 73.83 | 50.24 | 61.70 |
| Global score (Version Specific) | — | 78.17 | 78.19 | 47.42 | 65.31 |
a ++++: 4 (strongly agree); +++: 3; ++: 2; +: 1 (strongly disagree), —: no information, N/A: Not Applicable. The higher the agreement the better the rating. EQ-5D: EuroQol five dimensions questionnaire; FACIT-F: Functional Assessment of Chronic Illness Therapy-Fatigue; SF-36: 36-item Short Form Health Survey; HIT-6: Headache Impact Test-6; VAS: Visual Analogue Scale.