Table 1 Demographic features of IgG4-RD with/without PAO/PA

Age (years)

58.3 ± 11.1

52.6 ± 13.8

< 0.001*

Male/female ratio

5.85/1

1.35/1

< 0.001*

Disease duration (month), M (Q1–Q3)

6 (2.5–36)

12 (6–36)

< 0.001*

History of allergy (n, %)

25 (28.1)

267 (53.6)

< 0.001*

IgG4-RD RI

10.8 ± 5.3

9.8 ± 5.2

0.103

Number of organs involved

2.9 ± 1.9

3.0 ± 1.7

0.126

Patients with single organ involved (n, %)

24 (27.0)

66 (13.3)

0.001*