Onset is defined as the age in when study respondent first reports difficulties with specific ADL, IADL, or functional activity based on the disability definition.

Definition of Onset Under the Loprest and Maag Paper

Disability is described as the presence of activity and functional limitations, particularly for those who report hardship with the performance of at least one activity of daily living (ADL), and instrumental activity of daily living (IADL), or one or more functional activities.

University of Notre Dame

Early and late onset disabilities have notably different effects on employment outcomes. However, research shows that this connection goes even deeper, with disability onset affecting secondary education with further affects one's ability to attain work later in life and receive disability benefits.

Effects of Early and Late Onset Disabilities on Educational Attainment and Employment

Loprest, P., &amp; Maag, E. (2007). The relationship between early disability onset and education and Employment. Journal of Vocational Rehabilitation, 26(1), 1–43. https://doi.org/10.1037/e723332011-001 

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