Table 2:
Construct validity analysis, showing Spearman’s correlation coefficients between PROMIS PF10a scores and patient reported outcomes, physician assessed outcomes, and inflammatory markers among different subgroups
| Spearman’s correlation coefficients with PF10a (r) | ||||||
|---|---|---|---|---|---|---|
| Patient reported outcomes | Physician assessed outcomes | Inflammatory markers | ||||
| PGA (VAS) | Pain (VAS) | TJC | SJC | CRP | ESR | |
| Language | ||||||
| English, N=512 | −0.71* | −0.68* | −0.45* | −0.34* | −0.31* | −0.29* |
| Spanish, N=43 | −0.60* | −0.61* | −0.35* | −0.24 | −0.02 | −0.12 |
| Chinese, N=40 | −0.52* | −0.52* | −0.28 | −0.19 | −0.13 | −0.08 |
| Insurance | ||||||
| Private, N=236 | −0.72* | −0.66* | −0.61* | −0.49* | −0.33* | −0.24* |
| Medicare, 281 | −0.62* | −0.60* | −0.29* | −0.17* | −0.23* | −0.24* |
| Medicaid, 78 | −0.53* | −0.61* | −0.42* | −0.31* | −0.14 | −0.14 |
| Race/Ethnicity | ||||||
| White, N=297 | −0.69* | −0.67* | −0.44* | −0.33* | −0.34* | −0.28* |
| African American, N=38 | −0.62* | −0.53* | −0.45* | −0.12 | −0.04 | −0.32 |
| Hispanic, N=38 | −0.62* | −0.64* | −0.25 | −0.05 | 0.05 | 0.08 |
| Asian, N=115 | −0.64* | −0.65* | −0.40* | −0.33* | −0.26* | −0.13 |
| Other, N=118 | −0.69* | −0.65* | −0.48* | −0.41* | −0.14 | −0.31* |
Data source: Cross-sectional sample (N=595)
PGA: Patient global assessment; VAS: Visual analog scale; TJC: Tender joint count; SJC: Swollen joint count; CRP: C-reactive protein; ESR: Erythrocyte sedimentation rate; PF10a: Physical function short-form 10a
*
P<0.05
r<−0.6: Strong correlation; −0.3> r >−0.6: Moderate correlation; r>−0.3: Weak correlation