The MCP2 and the wrist plus two extensor compartments are the most affected and responsive joints/tendons out of the US7 score in patients with rheumatoid arthritis-an observational study

Table 5 Proportion of the US7 score’s information retained by different joint/tendon combinations

Mode	Joint/tendon combination	All		Early RA		Established RA
Mode	Joint/tendon combination	n	Corrected R²	n	Corrected R²	n	Corrected R²
GS	GS1	420	0.596	131	0.576	289	0.604
	GS2	410	0.686	128	0.701	282	0.686
	GS3	420	0.627	131	0.628	289	0.628
	GS4	410	0.712	128	0.739	282	0.704
	GS5	399	0.748	127	0.775	272	0.736
PD	PD1	375	0.588	116	0.682	259	0.570
	PD2	331	0.732	99	0.784	232	0.712
	PD3	316	0.652	99	0.824	217	0.646
	PD4	373	0.653	116	0.721	257	0.618
	PD5	330	0.750	99	0.818	231	0.722
	PD6	313	0.711	97	0.872	216	0.665
	PD7	293	0.837	89	0.932	204	0.771
	PD8	256	0.868	70	0.950	186	0.813
	PD9	295	0.785	91	0.856	204	0.735
GS/PD	GS2 + PD9	290	0.756	89	0.855	201	0.727

The corrected r² delivered the proportion of information in the total US7 GS score/PD score retained by the selected combinations. Combinations: see Table 4; combinations in bold were included in the reduced score; GS greyscale Scale, PD power Doppler

ISSN: 1478-6362