Table 5.
IRT-Based Sum Score Crosswalk to the Unified Depression Metric
| Sum Score | ASR to PROMIS T-Score | ASR to PROMIS SD | BSI to PROMIS T-Score | BSI to PROMIS SD | Sum Score |
|---|---|---|---|---|---|
| 0 | 36.5 | 6.5 | 38.7 | 6.1 | 0 |
| 1 | 40.6 | 5.7 | 45.0 | 4.3 | 1 |
| 2 | 43.7 | 5.2 | 48.3 | 3.8 | 2 |
| 3 | 46.5 | 4.6 | 50.6 | 3.5 | 3 |
| 4 | 48.9 | 4.1 | 52.6 | 3.3 | 4 |
| 5 | 51.0 | 3.8 | 54.3 | 3.0 | 5 |
| 6 | 52.8 | 3.5 | 55.9 | 2.9 | 6 |
| 7 | 54.4 | 3.3 | 57.3 | 2.8 | 7 |
| 8 | 56.0 | 3.2 | 58.6 | 2.7 | 8 |
| 9 | 57.4 | 3.2 | 59.8 | 2.7 | 9 |
| 10 | 58.7 | 3.1 | 61.0 | 2.6 | 10 |
| 11 | 60.0 | 3.1 | 62.1 | 2.6 | 11 |
| 12 | 61.2 | 3.1 | 63.2 | 2.6 | 12 |
| 13 | 62.5 | 3.0 | 64.4 | 2.6 | 13 |
| 14 | 63.7 | 3.0 | 65.5 | 2.6 | 14 |
| 15 | 65.0 | 3.0 | 66.6 | 2.6 | 15 |
| 16 | 66.3 | 3.0 | 67.7 | 2.6 | 16 |
| 17 | 67.5 | 3.0 | 68.9 | 2.7 | 17 |
| 18 | 68.8 | 3.0 | 70.1 | 2.7 | 18 |
| 19 | 70.1 | 3.1 | 71.4 | 2.8 | 19 |
| 20 | 71.4 | 3.2 | 72.8 | 3.0 | 20 |
| 21 | 72.8 | 3.3 | 74.3 | 3.1 | 21 |
| 22 | 74.2 | 3.4 | 75.9 | 3.2 | 22 |
| 23 | 75.7 | 3.5 | 78.1 | 3.5 | 23 |
| 24 | 77.4 | 3.7 | 81.3 | 4.3 | 24 |
| 25 | 79.2 | 3.9 | 25 | ||
| 26 | 81.2 | 4.2 | 26 | ||
| 27 | 83.5 | 4.5 | 27 | ||
| 28 | 86.3 | 4.9 | 28 |
Abbreviations: ASR=Adult Self Report; BSI=Brief Symptom Inventory; PROMIS=Patient Reported Outcomes Measurement Information System
Note: This crosswalk table assumed a prior distribution consistent with the PROMIS metric centered on the 2000 USA general population (i.e. mean=50.0, SD=10.0), though the MSM sample used to develop the relationship had a slightly different distribution (mean=54.4, SD=9.6)