(b).

Variable	B	Std error	Beta	t	p value
Constant	−10.450	5.357		−1.951	0.062
Age	0.164	0.047	0.556	3.492	0.002
W/H-ratio	11.326	5.345	0.344	2.119	0.044
OA grade	−0.227	0.695	−0.055	−0.327	0.746

OA: osteoarthritis, MAP: mean arterial pressure, hs-CRP: high-sensitivity C-reactive protein, and W/H-ratio: waist-to-hip ratio.