Variable | Green (+1 point) | Yellow (+0 .5 points) | Red (−1 point) |
---|---|---|---|
Test–retest (use middle of interval) | ICC or correlation >0.8. κ>0.7 | ICC or correlation >0.6 or κ>0.5 | ICC or correlation <0.6 or κ<0.5 |
Validity | Good validity on a number of factors | – | Ceiling or floor effects with poor discriminant validity |
Responsiveness | Set in the present or past few weeks, known to be responsive | – | Known to be not responsive, set in the past or on the life continuum, floor or ceiling effects |
Measure of health | Yes | – | No |
Measure of wellbeing or quality of life | Yes | – | No |
Clarity | Easy | Moderate | Complex |
Use of subjective measures | Yes | – | No |
Global assessment of health or wellbeing made | Yes | – | No |
Used cross-culturally | Many languages | Other than English | Only English, not documented |
Length | ≤10 min or ≤15 items (either) | <30 mins or 50 items (either) | ≥50 items ≥30 min |
Cronbach’s α (use middle of interval) | ≥0.8 | ≥0.6 to <0.8 | <0.6 |
Cost | Free to use for research purposes | Reasonable one-off payment | Expensive |
ICC, intraclass correlation coefficient.