Fig. (1) Serum (A) and urinary pentosidine (B) in patients with erosive and non-erosive hand osteoarthritis (HOA). The serum pentosidine levels were normalised to the levels of total serum protein (S-PEN/TP), and the urine pentosidine levels were normalised to the creatinine levels (U-PEN/cr.). The horizontal lines represent the median value.