Multivariable logistic regression (adjusted OR, 95% CI) evaluating the odds of belonging to the Head and Neck-Limited group based on selected covariates (derivation cohort)
| Covariate | ‘Head and Neck-Limited’ versus ‘Pancreato-Hepato-Biliary’ | ‘Head and Neck-Limited’ versus ‘Retroperitoneum and Aorta’ | ‘Head and Neck-Limited’ versus ‘Mikulicz and Systemic’ |
| Female | 11.60 (5.39 to 24.98) | 10.35 (4.63 to 23.15) | 9.24 (3.53 to 24.20) |
| Asian | 6.68 (2.82 to 15.79) | 7.43 (2.97 to 18.56) | 6.27 (2.27 to 17.29) |
| Age at diagnosis (per 5 years) | 0.78 (0.67 to 0.89) | 0.85 (0.74 to 0.98) | 0.80 (0.68 to 0.95) |
| Time to diagnosis (per year) | 1.41 (1.19 to 1.66) | 1.14 (1.04 to 1.26) | 1.12 (0.99 to 1.25) |
| Serum IgG4 concentration (per 100 mg/dL) | 1.03 (0.96 to 1.11) | 1.20 (1.05 to 1.36) | 0.90 (0.84 to 0.96) |
IgG4-RD, IgG4-related disease.