Table 4

Logistic regression of work disability employment status in SLE to obtain p values after dropping insignificant variables using STEPWISE elimination

β coefficientp Value (multivariate)OROR 95% CI
Disease duration
 SLICC/DI, score >10.21*0.0141.2321.0421.4
Pain score
 FACIT-Fatigue Score−0.05<0.0010.9550.9330.974
CES-D Score (>10)
 BCSI (≤25, 100=best function)0.02*0.0171.0151.0031.029
 American race−0.810.0030.4460.2660.748
  • ORs shown from final stepwise logistic regression model, after eliminating insignificant variables from the model. Controlled for slight multicollinearity by using ridge regression. Ridge coefficient=0.012, indicative of minimal effect on coefficients.

  • *SLICC, CES-D and BCSI were entered into the model as actual scoring variables and not 1/0 categories. N=254.

  • BCSI, Brief Cognitive Symptoms Index; CES-D, Center for Epidemiologic Studies Depression Scale Short Form; FACIT, Functional Assessment of Chronic Illness Therapy; SLE, systemic lupus erythematous; SLICC/DI, Systemic Lupus International Collaborative Clinics/American College of Rheumatology Damage Index.