Multivariate regression analysis for Mental Component Summary scores.
| Explanatory variables | Estimate | SE | Confidence Limit | p |
|---|---|---|---|---|
| Intercept | 54.37 | 2.00 | 50.43, 58.31 | < 0.001 |
| NP status | < 0.001 | |||
| SLE NP currently | −7.92 | 1.96 | −11.82, −4.01 | |
| Only non-SLE NP currently | −5.54 | 1.44 | −8.42, −2.66 | |
| NP-negative currently and SLE NP at previous assessment | −5.84 | 3.59 | −13.01, 1.33 | |
| NP-negative currently and only non-SLE NP at previous assessment | −2.40 | 1.30 | −5.00, 0.20 | |
| NP-negative currently and at previous assessment | 0 | — | — | |
| Caucasian race | ||||
| Yes | −5.48 | 2.08 | −9.58, −1.38 | 0.009 |
| No | 0 | |||
| Age at enrolment ≥ 45 yrs | ||||
| Yes | 3.21 | 1.46 | 0.33, 6.08 | 0.029 |
| No | 0 | — | — | |
| Disease duration at current assessment < 3 years | ||||
| Yes | −1.96 | 1.23 | –4.39, 0.46 | 0.112 |
| No | 0 | — | — | |
| Medications ever used | < 0.001 | |||
| Cluster 1: no; cluster 2: no; cluster 3: no | 8.71 | 1.95 | 4.79, 12.63 | |
| Cluster 1: no; cluster 2: no; cluster 3: yes | 0.28 | 2.57 | −4.88, 5.44 | |
| Cluster 1: no; cluster 2: yes; cluster 3: no | −3.63 | 3.30 | −10.25, 2.99 | |
| Cluster 1: no; cluster 2: yes; cluster 3: yes | −0.08 | 1.20 | −2.49, 2.33 | |
| Cluster 1: yes; cluster 2: no; cluster 3: no* | ||||
| Cluster 1: yes; cluster 2: no; cluster 3: yes | 3.91 | 3.01 | –2.12, 9.95 | |
| Cluster 1: yes; cluster 2: yes; cluster 3: no | 0.39 | 1.88 | –3.38, 4.16 | |
| Cluster 1: yes; cluster 2: yes; cluster 3: yes | 0 | — | — | |
↵* No data were available for this estimation. NP: neuropsychiatric