AR and amyotrophic lateral sclerosis: To validate the AR finding, we tested an independent Norwegian ALS cohort (n = 568), defining survival as time from onset to death or last contact due to lack of ventilation data.68 No significant associations were found with AR repeat size (max: P = 0.38; best threshold ≥28: HR = 0.98, 95% CI = 0.94–1.01, P = 0.22; Table S27).