Table 3

Relationship between items assessing OMERACT RA Flare domains and other measures by flare status*

			Patient		Physician		DAS28†
Domains		All	Yes	No	Yes	No	Yes	No
N	Source	849	201	648	233	485	84	431
Pain
How much pain due to RA in past week	HAQ	0.91	0.89	0.89	0.91	0.90	0.88	0.89
Today's level of pain today	RADAI	0.87	0.86	0.81	0.84	0.84	0.84	0.86
Pain past week	–	0.92	0.91	0.88	0.92	0.89	0.93	0.91
Joint area pain severity (0–48)	RADAI	0.71	0.55	0.67	0.58	0.70	0.44	0.72
Patient tender joint count (28)	Patient	0.62	0.36	0.57	0.48	0.58	0.48	0.61
MD tender joint count (28)	MD	0.49	0.29	0.42	0.36	0.42	0.36	0.46
Physical function
Disability score (0–3)	HAQ	0.76	0.73	0.68	0.74	0.70	0.74	0.74
Physical function	RAND-12	−0.65	−0.62	−0.58	−0.59	−0.64	−0.61	−0.68
Daily activities in past 7 days	WPAI	0.77	0.67	0.74	0.75	0.76	0.69	0.77
Fatigue
Vitality (RAND-12)	RAND-12	−0.63	−0.58	−0.59	−0.70	−0.59	−0.69	−0.65
Unusual fatigue/tiredness past week	–	0.86	0.86	0.83	0.85	0.85	0.84	0.87
Participation
Role—physical	RAND-12	−0.71	−0.69	−0.63	−0.67	−0.69	−0.72	−0.72
Social function	RAND-12	−0.61	−0.61	−0.54	−0.67	−0.61	−0.72	−0.67
Productivity while working	WPAI	0.78	0.73	0.70	0.77	0.73	0.71	0.77
RA affecting daily activities	WPAI	0.77	0.70	0.73	0.76	0.78	0.81	0.76
Stiffness
Morning Joint Stiffness Score	RADAI	0.69	0.51	0.66	0.57	0.67	0.58	0.69

*Spearman correlation coefficients for second visit.
†DAS28 scores <3.2 at second visit required an increase of 1.2 units whereas DAS≥3.2 at second visit required increase of 0.6 units to classify flare.
DAS, Disease Activity Score; HAQ, Health Assessment Questionnaire; OMERACT, Outcome Measures in Rheumatology Clinical Trials; RA, rheumatoid arthritis; RADAI, Rheumatoid Arthritis Disease Activity Index; RAND-12, RAND 12 Health Survey; WPAI, Work Productivity and Activity Impairment.