Table 1.
Characteristics of Three Samples
| Sample 1 (N1=261) |
Sample 2 (N2=240) |
Sample 3 (N3=258) |
||||
|---|---|---|---|---|---|---|
| Clinical Population | Chronic low back pain | Chronic musculoskeletal pain | Stroke survivors | |||
| Recruitment Setting | Primary care | Primary care | Neurology | |||
| Age, mean (SD) | 57.9 | (9.5) | 58.3 | (13.7) | 61.7 | (10.8) |
| Male, n (%) | 241 | (92.3) | 208 | (86.7) | 209 | (81.0) |
| Race, n (%) | ||||||
| White | 191 | (73.2) | 207 | (86.2) | 166 | (64.3) |
| Black | 54 | (20.7) | 18 | (7.5) | 78 | (30.2) |
| Other | 16 | (6.1) | 15 | (6.3) | 14 | (5.4) |
| Education, n (%) | ||||||
| Less than high school | 17 | (6.5) | 6 | (2.5) | 31 | (12.2) |
| High school | 82 | (31.4) | 71 | (29.6) | 85 | (33.3) |
| Technical school or some college | 122 | (46.8) | 103 | (42.9) | 80 | (31.4) |
| College degree or greater | 40 | (15.3) | 60 | (25.0) | 59 | (23.1) |
| Marital status, n (%) | ||||||
| Married | 139 | (53.3) | 135 | (56.5) | 135 | (52.5) |
| Divorced | 77 | (29.5) | 60 | (25.1) | 68 | (26.5) |
| Other | 45 | (17.2) | 44 | (18.4) | 54 | (21.0) |
| PROMIS-PI T-scores, mean (SD) | ||||||
| Pain 4-item | 62.3 | (6.9) | 61.7 | (5.3) | 53.2 | (10.4) |
| Pain 6-item | 62.3 | (7.0) | 61.6 | (5.4) | 53.1 | (10.6) |
| Pain 8-item | 62.0 | (6.8) | 61.5 | (5.3) | 53.1 | (10.6) |
| Pain short-form | 62.1 | (6.7) | 60.9 | (5.1) | 53.2 | (10.3) |
| Brief pain inventory interference (possible range: 0–10), mean (SD) | 6.4 | (2.1) | 5.5 | (1.9) | 2.7 | (3.0) |
| Cross-sectional Global Ratings of Pain (possible range: 0–4), mean (SD) | 2.4 | (0.7) | 2.2 | (0.6) | 1.4 | (1.2) |
| Disability days in the past 4 weeks, mean (SD) | 16.4 | (8.6) | 10.3 | (9.0) | 5.1 | (7.7) |