Skip to main content

Table 4 Stepwise regression model for predictors of change in HAQ-DI from month 6 to month 0 (P < 0.001)

From: Use of a “critical difference” statistical criterion improves the predictive utility of the Health Assessment Questionnaire-Disability Index score in patients with rheumatoid arthritis

Variable

Coefficienta,b

Partial R2

Cumulated R2

Change in pain (month 6 – month 0)c

0.10333

0.27893

0.2789

Baseline HAQ-DI

−0.35821

0.05436

0.333

Baseline pain

0.06382

0.04669

0.3800

Age

0.00493

0.02033

0.4003

Change in DAS28 (month 6 – month 0)c

0.06488

0.01115

0.4115

Disease duration

0.00645

0.00813

0.4196

Body mass index

0.00730

0.00537

0.4250

Baseline DAS28

0.04143

0.00450

0.4295

  1. Model intercept = −0.62463
  2. Abbreviations: DAS28 Disease Activity Score-28 joints, HAQ-DI Health Assessment Questionnaire-Disability Index
  3. aThe coefficient shows the influence for each unit of the predictor’s scale
  4. bBecause a negative value for HAQ-DI month 6 – month 0 indicates an improvement, variables with negative coefficients are positive predictors and those with positive coefficients are negative predictors
  5. cHigher values on these scales represent greater impairment, so higher values for month 6 – month 0 correspond to lack of improvement and are a negative predictor for improvement in HAQ-DI