Short-term prediction of secondary progression in a sliding window: A test of a predicting algorithm in a validation cohort

• Published in: Multiple sclerosis journal - experimental, translational and clinical Vol. 5; no. 3; p. 2055217319875466
• Main Authors: Skoog, B, Link, J, Tedeholm, H, Longfils, M, Nerman, O, Fagius, J, Andersen, O
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.07.2019; Sage Publications Ltd
• Subjects: Epidemiology; Multiple sclerosis; Original Research Paper; outcome measurement; progressive; relapsing/remitting; progressive; Epidemiology; multiple sclerosis; outcome measurement; relapsing/remitting
• ISSN: 2055-2173; 2055-2173
• DOI: 10.1177/2055217319875466

Introduction The Multiple Sclerosis Prediction Score (MSPS, www.msprediction.com) estimates, for any month during the course of relapsing–remitting multiple sclerosis (MS), the individual risk of transition to secondary progression (SP) during the following year. Objective Internal verification of the MSPS algorithm in a derivation cohort, the Gothenburg Incidence Cohort (GIC, n =  144) and external verification in the Uppsala MS cohort (UMS, n = 145). Methods Starting from their second relapse, patients were included and followed for 25 years. A matrix of MSPS values was created. From this matrix, a goodness-of-fit test and suitable diagnostic plots were derived to compare MSPS-calculated and observed outcomes (i.e. transition to SP). Results The median time to SP was slightly longer in the UMS than in the GIC, 15 vs. 11.5 years (p = 0.19). The MSPS was calibrated with multiplicative factors: 0.599 for the UMS and 0.829 for the GIC; the calibrated MSPS provided a good fit between expected and observed outcomes (chi-square p = 0.61 for the UMS), which indicated the model was not rejected. Conclusion The results suggest that the MSPS has clinically relevant generalizability in new cohorts, provided that the MSPS was calibrated to the actual overall SP incidence in the cohort.