The Role of Power Doppler Ultrasonography as Disease Activity Marker in Rheumatoid Arthritis

Table 1

Composite indices measuring disease activity in rheumatoid arthritis.

Instrument	Components	Thresholds of disease
		Activity levels
Clinical disease activity index (CDAI) (range from 0 to 76.0)	Tender joint count	Remission: ≤2.8
	Swollen joint count	Low activity: from >2.8 to 10.0
	Physician global assessment	Moderate: from >10 to 22.0
	Patient global assessment	High: >22.0
Disease activity score in 28 joints (DAS28) (range from 0 to 9.4)	Tender joint count	Remission: <2.6
	Swollen joint count	Low activity: from ≥2.6 to <3.2
	Patient global assessment	Moderate: from ≥3.2 to ≤5.1
	ESR	High: >5.1
Simplified disease activity index (SDAI) (range 0 to 86.0)	Tender joint count	Remission: ≤3.3
	Swollen joint count	Low activity: from >3.3 to ≤11.0
	Patient global assessment	Moderate: from >11.0 to ≤26.0
	CRP	High: >26.0