Table 3.
PROMIS PF full bank and short form scoring characteristics and agreement with simulated “true” scores
| General health groups | True PF T-scorea mean (SD) |
Full bank (124 items)b | Format Ae (5-item short form) | Format B (5-item short form) | Format C (5-item short form) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T-score mean (SD) | RMSEc | Percentage floor/percentage ceilingd | T-score mean (SD) | RMSE | Percentage floor/percentage ceiling | T-score mean (SD) | RMSE | Percentage floor/percentage ceiling | T-score mean (SD) | RMSE | Percentage floor/percentage ceiling | ||
| Poor | 35.6 (6.5) | 35.7 (6.4) | 0.7 | 0.0/0.0 | 36.6 (6.3) | 3.0 | 3.9/0.2 | 36.4 (6.3) | 2.7 | 1.5/0.2 | 36.3 (6.3) | 2.7 | 0.5/0.0 |
| Fair | 41.9 (7.6) | 41.9 (7.7) | 0.8 | 0.0/0.0 | 42.5 (7.9) | 2.9 | 1.3/3.8 | 42.3 (790) | 2.6 | 0.5/4.6 | 42.3 (7.7) | 2.5 | 0.2/0.7 |
| Good | 48.9 (7.8) | 49.0 (7.9) | 1.1 | 0.0/0.1 | 49.4 (8.0) | 3.2 | 0.1/17.0 | 49.4 (8.0) | 3.1 | 0.0/21.5 | 49.1 (7.9) | 2.6 | 0.0/6.2 |
| Very good | 54.4 (7.2) | 54.5 (7.3) | 1.5 | 0.0/0.2 | 54.5 (6.9) | 3.8 | 0.0/37.9 | 54.5 (6.8) | 3.7 | 0.0/45.4 | 54.4 (7.3) | 2.9 | 0.0/16.8 |
| Excellent | 58.8 (6.5) | 58.7 (6.4) | 1.9 | 0.0/0.7 | 57.8 (5.3) | 4.3 | 0.0/59.0 | 57.8 (5.0) | 4.4 | 0.0/67.1 | 58.4 (6.3) | 3.3 | 0.0/32.6 |
| Full sample | 47.9 (11.0) | 48.0 (11.0) | 1.3 | 0.0/0.2 | 48.1 (10.4) | 3.5 | 1.1/23.6 | 48.1 (10.5) | 3.4 | 0.4/27.8 | 48.1 (10.5) | 2.8 | 0.1/11.3 |
a T-scores have a mean of 50 and standard deviation of 10 in the analytic sample. bFinal Patient Reported Outcomes Measurement Information System Physical Function (PROMIS PF) item bank version 1.0. cRSME = root mean square error between estimated T-scores and simulated “true” T-scores. dPercentage of the simulated sample who reached the lowest (“floor”) or highest (“ceiling”) possible score. eFormat A: “Are you able to …” (five-category response scale from “Without any difficulty” to “Unable to do”); Format B: “Does your health now limit you in …” (five-category response scale from “Not at all” to “Cannot do”); format C: “How difficult is it for you to…” (six-category response scale from “Very easy” to “Impossible”)