The relationship between synovitis quantified by an ultrasound 7-joint inflammation score and physical disability in rheumatoid arthritis – a cohort study

Table 2 Standard (current) model

Predictor	RA	β (95% CI)	P value^*	P value^**	Percent variability explained - R ²
DAS28-CRP	all	0.186 (0.157; 0.216)	<0.001		41.3
	i	0.234 (0.174; 0.295)	<0.001	0.072
	p	0.171 (0.137; 0.204)	<0.001
GSsynSS	all	0.018 (0.011; 0.026)	<0.001		3.2
	i	0.035 (0.020; 0.050)	<0.001	0.013
	p	0.013 (0.004; 0.022)	0.003
PDsynSS	all	0.025 (0.015; 0.035)	<0.001		3.6
	i	0.038 (0.021; 0.055)	<0.001	0.056
	p	0.018 (0.006; 0.030)	0.004
GStenSS	all	0.048 (0.004; 0.092)	0.033		2.4
	i	0.123 (0.039; 0.207)	0.004	0.038
	p	0.019 (-0.032; 0.071)	0.460
PDtenSS	all	0.051 (0.019; 0.082)	0.002		2.8
	i	0.100 (0.039; 0.162)	0.001	0.064
	p	0.033 (-0.003; 0.070)	0.073
ES	all	0.007 (-0.022; 0.036)	0.632		0.3
	i	-0.024 (-0.102; 0.054)	0.549	0.390
	p	0.013 (-0.019; 0.045)	0.416

Univariate analyses and interaction with incident (i) or prevalent (p) rheumatoid arthritis (RA). Predicted variable is current health assessment questionnaire (HAQ) score, univariate predictors are current disease activity score in 28 joints using C-reactive protein (DAS28-CRP), sum-scores (SS) for greyscale (GS) and power Doppler (PD) synovitis, GS and PD tenosynovitis (ten), and erosions score (ES). ^* P value of significance of given β. ^** P value of significance of difference between incident and prevalent RA. P-values higlighted in italics are significant at p < 0.05

ISSN: 1478-6362