CXCL10 and gout: As shown in Fig. 3, CXCL10 levels (median 5.39 ng/ml, IQR 1.81–9.82 ng/ml) were significantly elevated in PsA compared with OA (median 0.83 ng/ml, IQR 0.73–3.38 ng/ml; p = 6 × 10−4) and gout (median 0.97 ng/ml, IQR 0.80–1.48 ng/ml; p = 0.004).