ALB and polyarteritis nodosa: There were no significant differences in baseline characteristics between the groups (PAN, n = 189; GI, n = 286) in terms of age, sex, PS (≥2 vs. 0–1), BMI (<18.5 vs. ≥18.5), albumin (<35 vs. ≥35 g/L), CRP (>10 vs. ≤10), and hospital size (small/medium/large) (Table 1).