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A clinical-based staging model would guide physicians in the prompt management of the evolving symptoms and functional needs of patients with amyotrophic lateral sclerosis (ALS). We aimed to delineate the clinical trajectory of ALS in Singapore and test the degree of congruity of King's College staging for ALS (King's staging) among Singapore patients. In this retrospective cohort study, clinical milestones used for staging were identical to King's staging stage 1 corresponded to symptom onset; stage 2A corresponded to diagnosis; stage 2B