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Table 4 Canadian prediction model with respective βi coefficients before and after fine-tuning in the Nordic JIA cohort

From: Validation of prediction models of severe disease course and non-achievement of remission in juvenile idiopathic arthritis: part 1—results of the Canadian model in the Nordic cohort

Predictor variables in the Canadian modelOriginal ReACCh-Out cohortaFine-tuned in the Nordic cohortb
ConstantIntercept = − 2.92Intercept = 2.76
Active joint count, n = 4400.180.21
Psoriatic arthritis, n = 440− 1.23− 1.40
Oligoarthritis, n = 440− 1.14− 0.72
RF-negative polyarthritis, n = 440− 0.49− 0.68
Upper limb joint involvement, n = 4400.75− 1.11
Symmetric joint involvement, n = 439− 0.880.68
RF positivity, n = 2411.31− 1.06
Subtalar joint involvement, n = 439− 1.42− 2.81
Finger joint involvement, n = 439− 0.311.31
Cervical spine involvement, n = 4390.840.38
Ankle joint involvement, n = 4390.48− 0.25
Presence of morning stiffness, n = 3400.561.64
Hip involvement, n = 4390.06− 0.50
TMJ-involvement, n = 4391.500.09
Mid foot involvement, n = 4390.540.39
Presence of enthesitis, n = 4370.861.26
  1. aCoefficients found by logistic regression in the Canadian cohort, previously reported [17]
  2. bThe changes in coefficients after fine-tuning in the Nordic JIA cohort