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Table 3 Correlations among PROMIS fatigue 7a, 8a, 4a, Rand Vitality and 10-point fatigue scores

From: PROMIS Fatigue short forms are reliable and valid in adults with rheumatoid arthritis

  Fatigue 8a Fatigue 4a Rand36 Fatigue NRS 7d Fatigue
Fatigue 7a r 0.94 0.91 0.86 0.85 0.86
N 548 546 388 347 546
Fatigue 8a r   0.98 0.87 0.88 0.93
N 549 388 351 546
Fatigue 4a r   0.86 0.88 0.96
N 387 348 544
Rand-36 Vitality r   0.81 0.82
N 344 387
Fatigue NRS
(0–10)
r   0.87
N 345