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Table 3 Disaggregated between-patient and within-patient associations between indices of disease activity and fatigue severity

From: Fatigue is associated with disease activity in some, but not all, patients living with rheumatoid arthritis: disentangling “between-person” and “within-person” associations

 

B (95% CI)

Standardized β (95% CI)

t

p

DAS28-ESR

    

 BP

0.732 (0.484–0.981)

0.270 (0.178–0.361)

5.801

 < 0.0001

 WP

0.610 (0.433–0.787)

0.148 (0.105–0.191)

6.774

 < 0.0001

CRP

    

 BP

0.013 (− 0.019–0.045)

0.033 (− 0.048–0.113)

0.798

0.425

 WP

0.046 (0.033–0.059)

0.127 (0.091–0.162)

7.017

 < 0.0001

ESR

    

 BP

0.008 (− 0.009–0.025)

0.037 (− 0.042–0.115)

0.92

0.358

 WP

0.049 (0.037–0.060)

0.142 (0.109–0.175)

8.506

 < 0.0001

SJC

    

 BP

0.024 (− 0.173–0.220)

0.009 (− 0.068–0.086)

0.235

0.814

 WP

0.209 (0.146–0.272)

0.104 (0.073–0.135)

6.546

 < 0.0001

TJC

    

 BP

0.372 (0.251–0.493)

0.217 (0.147–0.288)

6.064

 < 0.0001

 WP

0.173 (0.127–0.219)

0.118 (0.086–0.149)

7.341

 < 0.0001

VAS-GH

    

 BP

0.074 (0.064–0.085)

0.515 (0.443–0.588)

13.934

 < 0.0001

 WP

0.029 (0.023–0.035)

0.167 (0.130–0.203)

8.948

 < 0.0001

  1. DAS28-ESR disease activity score in 28 joint including the erythrocyte sedimentation rate; BP between-person association; WP within-person association; CRP C-reactive protein; ESR erythrocyte sedimentation rate; VAS-GH patient-reported assessment of General Health on a 100-mm visual analog scale