Psychometric properties of the single-item measure, severity of worst tiredness, in patients with moderately to severely active rheumatoid arthritis

Table 3 Pearson Correlations between Severity of Worst Tiredness and Other Instruments in RA-BEAM and RA-BUILD at Day 1

Instruments	Severity of Worst Tiredness
	RA-BEAM		RA-BUILD
	n	r	n	r
Day 1
Duration of MJS	537	0.21***	311	0.09
Severity of MJS	537	0.66***	311	0.52***
Severity of Worst Joint Pain	537	0.70***	310	0.59***
SF-36
Role Physical Domain	535	−0.44***	311	−0.39***
Bodily Pain Domain	535	−0.56***	311	−0.46***
General Health Domain	535	−0.37***	311	−0.33***
Social Functioning Domain	535	−0.44***	311	−0.35***
Vitality Domain	535	−0.49***	311	−0.53***
Role Emotional Domain	535	−0.35***	311	−0.21***
Mental Health Domain	535	−0.39***	311	−0.31***
Physical Functioning Domain	535	−0.47***	311	−0.38***
Mental Component Score	535	−0.38***	311	−0.31***
Physical Component Score	535	−0.47***	311	−0.41***
FACIT-F Total Score	535	−0.57***	311	−0.60***
HAQ-DI Total Score	535	0.48***	311	0.37***
QIDS-SR₁₆ Total Score	535	0.40***	311	0.37***
Patient’s Assessment of Pain	535	0.43***	311	0.29***
PtGA	535	0.45***	311	0.30***
Tender Joint Count 28	537	0.21***	311	0.30***
Swollen Joint Count 28	537	0.18***	311	0.20***
PhGA	535	0.21***	304	0.20***
hsCRP	535	0.37***	311	0.33***

Abbreviations: FACIT-F = Functional Assessment of Chronic Illness Therapy-Fatigue; HAQ-DI = Health Assessment Questionnaire-Disability Index; hsCRP = high-sensitivity C-reactive protein; MJS = morning joint stiffness; n = number of patients; PtGA = Patient’s Global Assessment of Disease Activity; PhGA = Physician’s Global Assessment of Disease Activity; QIDS-SR₁₆ = Quick Inventory of Depressive Symptomatology Self-Rated-16; SF-36 = 36-Item Short Form Health Survey version 2 with Acute recall
Pearson correlation coefficients with significance using p-values denoted as: * ≤ 0.05, ** ≤ 0.01, *** ≤ 0.001

ISSN: 1477-7525