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Table 3 C-indices for testing of Canadian and Nordic prediction models

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

Prediction model

Severe disease course outcome

Non-achievement of remission outcome

Validation method

Original Canadian model

0.85 (0.83–0.87)

0.66 (0.63–0.68)

External validation (bootstrapping)

Canadian model fine-tuned for Nordic population

0.85 (0.81–0.89)

0.69 (0.65–0.73)

Fine-tuning (repeated random splits)

Nordic model

0.90 (0.86–0.92)

0.78 (0.72–0.82)a

Internal validation (repeated random splits)

  1. C-indices with median interquartile range (IQR)
  2. C-index presented includes patients with systemic JIA, except for athe C-index for the Nordic model and the outcome non-achievement of remission previously published by Rypdal et al. [19]