Table 4.

Results of univariate linear regression analysis of the relation between the SUV_mean and clinical parameters of disease activity

	Coefficient	95% CI	p value	R 2
MMT8, 0–80	− 0.005	[− 0.009;− 0.002]	0.002	0.10
HAQ, 0–3	0.05	[0.02;0.08]	0.001	0.14
MD global activity, VAS 0–10 cm	0.01	[0.006;0.02]	0.001	0.12
PA global activity, VAS 0–10 cm	0.01	[0.001;0.02]	0.02	0.07
CK relative valuea	0.003	[− 0.001;0.007]	0.12	0.03

MMT8: each of eight muscle groups scored 0–10; lower scores indicate reduced strength. HAQ, MD, and PA global activity: higher scores indicate more severe disease activity

MMT8 manual muscle test including eight muscle groups, HAQ Health Assessment Questionnaire, MD physician, VAS visual analogue scale, PA patient

^aThe value of creatine kinase divided by the local upper reference value