Table A3.
Scale-Level descriptive statistics, reliability, and concurrent validity
| Item Bank, 39 Items | SF8, 8 Items | SF4, 4 Items | |
|---|---|---|---|
|
| |||
| Scale Descriptive Statistics (S1, n=909) | |||
| Range | 10.2–72.8 | 13.2–67.3 | 16.8–63.9 |
| Mean (SD) | 49.8 (11.2) | 49.6 (10.5) | 49.3 (9.9) |
| Floor, % | 1 (0.11%) | 2 (0.22%) | 2 (0.22%) |
| Ceiling, % | 56 (6%) | 109 (12%) | 176 (19.4%) |
|
| |||
| Reliability | |||
| Marginal Reliability (S1) | 0.97 | 0.93 | 0.91 |
| Test-Retest ICC (S1, n=52) | 0.70 | 0.71 | 0.70 |
|
| |||
| Convergent Validity, Pearson’s r | 0.88 | 0.86 | 0.85 |
| NIH Toolbox Proxy Positive Affect (S1, n=107) | 0.69 | 0.70 | 0.70 |
| NIH Toolbox Proxy Life Satisfaction (S1, n=102) | 0.83 | 0.81 | 0.80 |
| PROMIS Parent Proxy Life Satisfaction (S1, n=502) | 0.66 | 0.65 | 0.64 |
| PROMIS Parent Proxy Meaning and Purpose (S1, n=464) | |||
|
| |||
| Discriminant Validity, Pearson’s r | |||
| PROMIS Parent Proxy Anger (S2, n=1,306) | - | −0.56 | −0.50 |
| PROMIS Parent Proxy Anxiety (S2, n=1,306) | - | −0.40 | −0.36 |
| PROMIS Parent Proxy Pain Interference (S2, n=1,305) | - | −0.26 | −0.26 |
| PROMIS Parent Proxy Physical Stress Experiences (S2, n=1,285) | - | −0.38 | −0.36 |