Table 1

Multivariate regression results of factors affecting ultrasound scores, according to subgroups of younger (< 50 yrs) and older (≥ 50 yrs) age.

	< 50 Years, n = 48
	Inflammation Score		Damage Score		Total Score
	B (95% CI)	P	B (95% CI)	P	B (95% CI)	P
Intercept	−1.65 (−6.7 to 3.64)	0.51	−5.3 (−11.1 to 0.4)	0.06	−7.0 (−16.0 to 1.9)	0.12
Age	0.17 (−0.8 to 0.11)	0.73	0.79 (−0.3 to 0.19)	0.17	0.09 (−0.08 to 0.2)	0.28
Sex (men vs women)	1.07 (−0.4 to 2.6)	0.16	1.6 (−0.1 to 3.3)	0.06	2.7 (−0.1 to 5.4)	0.051
Smoking (ever vs never)	0.99 (−0.6 to 2.6)	0.23	0.9 (−0.9 to 2.8)	0.33	1.9 (−0.1 to 4.8)	0.19
BMI	0.12 (−0.4 to 0.29)	0.14	0.15 (−0.3 to 0.34)	0.10	0.27 (−0.1 to 0.5)	0.06
Physical activity (high vs low/moderate)	1.29 (−02 to 2.8)	0.99	1.9 (0.2–3.6)	0.02	3.2 (0.5–5.9)	0.02

Variables	≥ 50 Years, n = 27
	Inflammation Score		Damage Score		Total Score
	B (95% CI)	P	B (95% CI)	P	B (95% CI)	P
Intercept	−38.9 (−59 to −17)	0.001	−29.0 (−50 to −7)	0.01	−68 (−102 to −33)	0.001
Age	0.27 (0.13–0.53)	0.040	0.29 (0.02–0.5)	0.34	0.56 (0.13–0.99)	0.01
Sex (men vs women)	3.08 (−1.2 to 7.4)	0.15	1.8 (−2.5 to 6.3)	0.39	4.9 (−2.2 to 12.1)	0.16
Smoking (ever vs never)	−1.9 (−6.0 to 2.2)	0.34	−1.5 (−5.7 to 2.6)	0.45	−3.4 (−10 to 3.3)	0.30
BMI	1.06 (0.4–1.6)	0.001	0.66 (0.09–1.2)	0.02	1.7 (0.8–2.6)	0.001
Physical activity (high vs low/moderate)	4.0 (−0.4 to 8.6)	0.075	3.7 (−0.9 to 8.4)	0.11	7.8 (0.3–15.3)	0.04