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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 model

Original ReACCh-Out cohorta

Fine-tuned in the Nordic cohortb

Constant

Intercept = − 2.92

Intercept = 2.76

Active joint count, n = 440

0.18

0.21

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 = 440

0.75

− 1.11

Symmetric joint involvement, n = 439

− 0.88

0.68

RF positivity, n = 241

1.31

− 1.06

Subtalar joint involvement, n = 439

− 1.42

− 2.81

Finger joint involvement, n = 439

− 0.31

1.31

Cervical spine involvement, n = 439

0.84

0.38

Ankle joint involvement, n = 439

0.48

− 0.25

Presence of morning stiffness, n = 340

0.56

1.64

Hip involvement, n = 439

0.06

− 0.50

TMJ-involvement, n = 439

1.50

0.09

Mid foot involvement, n = 439

0.54

0.39

Presence of enthesitis, n = 437

0.86

1.26

  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