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Multiple sclerosis (MS) is an autoimmune demyelinating disease that often initially presents with optic neuritis (ON). Little is known about the demographic factors and familial histories that may be associated with the development of MS after a diagnosis of ON. We utilised a nationwide database to characterise specific potential drivers of MS following ON as well as analyse barriers to healthcare access and utilisation. The  All of Us  database was queried for all patients who were diagnosed with ON and for all patients diagnosed with MS after an initial diagnosis of ON. Demographic factors, family histories, and survey data were analysed. Multivariable logistic regression was performed to analyse the potential association between these variables of interest with the development of MS following a diagnosis of ON. Out of 369,297 self-enrolled patients, 1,152 were identified to have a diagnosis of ON, while 152 of these patients were diagnosed with MS after ON. ON patients with a family history of obesity were more likely to develop MS (obesity odd ratio: 2.46;  p  &lt; .01). Over 60% of racial minority ON patients reported concern about affording healthcare compared with 45% of White ON patients ( p  &lt; .01). We have identified a possible risk factor of developing MS after an initial diagnosis of ON as well as alarming discrepancies in healthcare access and utilisation for minority patients. These findings bring attention to clinical and socioeconomic risk factors for patients that could enable earlier diagnosis and treatment of MS to improve outcomes, particularly in racial minorities.

Risk Factors for Multiple Sclerosis Development After Optic Neuritis Diagnosis Using a Nationwide Health Records Database