Summary of the differences between the two IgG4-RD groups
| Variable | PB group (n=60) | HN group (n=14) | P |
| Sex (male) | 81.7% (n=49) | 57.1% (n=8) | 0.023 |
| Age, mean (SD) | 64.4 (12.5) | 51.1 (15.5) | 0.001 |
| History of atopy | 36.6% (n=22) | 28.5% (n=4) | 0.76 |
| Eosinophil count>upper limit of normal (ULN) | 21.7% (n=13) | 35.7% (n=5) | |
| Serum IgG4 as (ULN) | 74.5% (n=44/59) | 50% (n=7) | 0.10 |
| Serum IgG4 level, median (IQR) multiples of ULN | 2 [1–3.75) | 1(1-2) | |
| Elevated serum IgG4 after therapy | 84.1% (n=37/44) | 42.8% (n=3/7) | 0.031 |
| Number of organs involved>1 | 68.3% (n=41) | 33.3% (n=5) | 0.033 |
| Number of organs involved (median) | 2 | 1 |
HN, head and neck; PB, pancreatobiliary; ULN, upper limit of normal.