Table 4

Stepwise multiple regression showing 15 predictors ranked in order of magnitude in predicting group membership (FM or RA/SLE)

Predictors

Step and number of variables included

Multiple R

Multiple R2

R2 change

P value for predictor variable


Mid-lower back

1

0.540

0.291

0.291

0.00000

Tenderness to touch

2

0.637

0.406

0.115

0.00000

Neck

3

0.689

0.474

0.068

0.00000

Arms

4

0.712

0.507

0.033

0.00007

Hands

5

0.747

0.558

0.051

0.00000

Lateral lower back

6

0.758

0.575

0.017

0.00168

Sitting for 45 minutes

7

0.768

0.589

0.014

0.00367

Feeling overwhelmed

8

0.775

0.601

0.012

0.00750

Depression

9

0.784

0.615

0.014

0.00365

Sensitivity

10

0.791

0.626

0.011

0.00855

Thighs

11

0.797

0.635

0.009

0.01471

Feet

12

0.804

0.647

0.012

0.00529

Cleaning floors

13

0.806

0.649

0.003

0.16326

Anxiety

14

0.807

0.652

0.002

0.19893

Memory

15

0.809

0.654

0.002

0.21899


Note: This forward stepwise regression analysis used 15 predictors which combined to produce a multiple R = 0.809 (last row, column 2). This accounted for 65% of variance associated with group membership (column 3). FM, fibromyalgia; RA/SLE, combined rheumatoid arthritis and systemic lupus erythematosus group.

Friend and Bennett Arthritis Research & Therapy 2011 13:R58   doi:10.1186/ar3311

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