137 Inability to work fulltime and the association with paid employment one year after assessment partial work disability, or (4) no work disability. Individuals in the last two groups have residual earnings capacity and are encouraged to continue (parttime) employment with their current employer or seek a new (part-time) job that aligns with their residual work capacity. The UWV holds register data of these assessments, and has access to data on paid employment and income of all residents of the Netherlands. Data Data on socio-demographic factors, diagnoses and assessment outcomes including the estimation of inability to work fulltime were derived from the disability benefit assessment register of UWV and included all disability benefits assessments in 2016. These data were linked to register data on work status and income at the time of assessment up to one year after the assessment. UWV provided anonymized data. When studying the association between inability to work fulltime and having paid work, a follow-up of one year is suitable as it is likely that changes in the health-, social and societal situation impacting return to work will occur when the follow-up period increases. Longer follow-up makes it difficult to disentangle the impact of the inability to work fulltime assessment with impact from these changes. Design and study sample The study is a longitudinal register based cohort study of work disability applicants assessed with residual work capacity and who were granted a partial disability benefit in 2016. In 2016, N=40,263 workers applied for a disability benefit. Of these, N=30,177 (74.9%) were assessed with residual work capacity [2]. For this study, only applicants with residual work capacity who were granted a partial disability benefit were included. Therefore, applicants granted no (30.5%) or full (41.2%) disability benefit were excluded (n=21,624, 71.7%). Additionally, applicants who died, retired, or were detained for a period of time, within one year after the assessment (n=104), and those with missing data on the variables included in the analyses (n=149) were also excluded from the study. The final study sample for the current study included n=8300 applicants, which was 20.6% of all work disability benefit applicants in the Netherlands in 2016; see Figure 1. The Medical Ethics Review Board of the University Medical Center Groningen concluded (METc 2018/570, 23-102018) that this study is not clinical research with human subjects as meant in the Medical Research Involving Human Subjects Act (WMO). 7
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