Table 4.
Reliability and test–retest reliability of measurements of the full‐length (FL) item banks, short forms (SF), and computerized adaptive testing (CAT) of the pediatric PROMIS item banks in a sample of children with juvenile idiopathic arthritis (n = 155)*
| PROMIS item |
Mean FL SE(θ) |
FL SE(θ) <0.32, no. (%) † |
Mean SF SE(θ) |
SF SE(θ) <0.32, no. (%) † |
Mean CAT SE(θ) |
CAT SE(θ) <0.32, no. (%) † |
Mean CAT items administered |
FL, no. of items |
SF, no. of items |
FL, ICC (95% CI) (n = 101) |
SF, ICC (n = 101) |
SDC (n = 101) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Anger scale | 0.37 | 89 (57.4) | 0.51 | 89 (57.4) | 0.40 | 89 (57.4) | 3.6 | 5 | 5 | 0.70 (0.59–0.70) | 0.70 | 15.3 |
| Anxiety | 0.36 | 86 (55.5) | 0.52 | 73 (47.1) | 0.41 | 84 (54.2) | 5.6 | 13 | 8 | 0.77 (0.68–0.84) | 0.76 | 13.5 |
| Depressive symptoms | 0.34 | 89 (57.4) | 0.75 | 78 (50.3) | 0.40 | 88 (56.8) | 5.2 | 13 | 8 | 0.79 (0.70–0.85) | 0.77 | 14.2 |
| Fatigue | 0.20 | 123 (79.4) | 0.40 | 108 (69.7) | 0.31 | 114 (73.5) | 4.7 | 23 | 10 | 0.87 (0.82–0.91) | 0.85 | 17.2 |
| Mobility | 0.30 | 106 (67.5) | 0.54 | 79 (50.3) | 0.37 | 99 (63.1) | 5.3 | 23 | 8 | 0.84 (0.76–0.89) | 0.81 | 13.3 |
| Pain interference | 0.27 | 108 (69.7) | 0.40 | 103 (66.5) | 0.36 | 106 (68.4) | 4.5 | 13 | 8 | 0.83 (0.77–0.89) | 0.82 | 13.6 |
| Peer relationships | 0.29 | 112 (72.3) | 0.41 | 82 (52.9) | 0.36 | 97 (62.6) | 5.8 | 15 | 8 | 0.69 (0.58–0.78) | 0.72 | 18.7 |
| Upper extremity | 0.38 | 76 (48.7) | 0.84 | 65 (41.7) | 0.45 | 70 (44.9) | 6.0 | 29 | 8 | 0.86 (0.80–0.90) | 0.84 | 12.1 |
PROMIS = Patient‐Reported Outcomes Measurement Information System; SE(θ) = SE of theta; ICC = intraclass correlation coefficient; 95% CI = 95% confidence interval; SDC = smallest detectable change.
Number of patients with an SE(θ) <0.32. An SE(θ) of 0.32 equals a reliability of 0.90.