Why Accommodation Quality Predicts RTW Outcomes

The Variable Nobody Measures

When a disability claim runs long, the first question is usually about the diagnosis. What is the condition? What does the treatment plan say? When will functional abilities improve?

These are reasonable questions. They are also incomplete.

Mustard et al. (2024) followed 1,793 Ontario workers disabled by a work-related injury or illness and found that inadequate workplace accommodation carried a relative risk of 2.72 (95% CI: 2.20-3.73) for health-related permanent employment separation. Workers whose accommodation was inadequate were nearly three times as likely to leave or lose their job for health reasons within 18 months as those whose accommodation was adequate.

The two groups were weighted to look alike on the type of injury and on worker and workplace characteristics. Treatment was not measured. The difference the study could see was what happened when they came back to work.

What “Adequate” Actually Means

The research does not use “adequate” loosely. Mustard and colleagues asked two questions: did the workplace offer modified or alternate duties, and did someone from the workplace help coordinate the dates, activities and hours of the return? An offer with no coordination counted as inadequate, and so did no offer at all for a worker who then struggled to get back. That is a floor. Accommodation quality can be assessed across five dimensions, and the evidence for each is set out below. It is stronger for some than for others.

1. Timeliness

Kools and Koning (2019) analysed administrative data from a Dutch workplace reintegration provider. Graded return to work started in the first 26 weeks of absence added 18 weeks worked over the first two years, compared with workers who had not started it by then, and work resumed faster the earlier it started. It did not change whether people were back at work by the two-year mark, and the effects did not hold for mental health problems.

Franche et al. (2005), in a systematic review of 10 studies of musculoskeletal and pain-related conditions, found strong evidence that work accommodation offers reduced work disability duration, and moderate evidence that early contact with the worker by the workplace did.

Delayed accommodation slows the return to work. On this evidence, that is what timing changes: how fast people get back, more than whether they do. Weeks of work are still weeks of work.

2. Adequacy of Match

Jessiman-Perreault et al. (2025) surveyed 955 Canadians working with physical or mental and cognitive disabilities and found that having work modification needs met was associated with a 7.7% decrease in lost work time. But the finding cuts both ways: having workplace flexibility needs met was associated with a 9.9% increase in lost work time, which the authors explain by flexibility letting workers attend to personal needs during working hours.

This is not a failure of accommodation. It is accommodation working correctly. Adequate matching means the accommodation fits the actual functional limitation, not a generic category. An ergonomic modification for a musculoskeletal condition is not interchangeable with a flexible schedule for a mental health condition.

3. Worker Involvement

Worker involvement has the thinnest direct evidence of the five. In a systematic review of workplace accommodation for people with disabilities, Nevala et al. (2015) named self-advocacy among the key factors that helped or hindered employment, alongside support from the employer and flexibility in schedules and work organization. That finding comes from qualitative studies.

The reasoning is not complicated: the worker knows what they need. When the accommodation plan is designed without their input, the probability of mismatch increases.

4. Supervisor Capability

Accommodation quality depends on whether the supervisor can execute it. The evidence here is thinner than it should be. Franche et al. (2005) noted that supervisors were often present at the ergonomic workplace visits in the studies they reviewed, and suggested supervisors may play an essential role in a good return to work. Cullen et al. (2018) found only one study of supervisor training on its own, the Shaw study below, and judged that too little to go on.

Shaw et al. (2006) gave 11 supervisors in a food processing plant a four-hour workshop on communication and accommodation for workers reporting injuries. Comparing claims in the seven months before and after the workshop, new claims fell 47% and active lost-time claims 18% in that group, against 27% and 7% for a comparison group of 12 supervisors in the same plant who were trained later. The training did not touch the diagnosis. It was aimed at how the supervisor responded.

5. Ongoing Monitoring

Accommodation is not a one-time decision. Conditions change. Functional abilities evolve. What worked in week two may not work in week eight. This is the dimension the research has looked at least. Franche et al. (2005) found the evidence on whether effects lasted beyond a year insufficient or limited, and Gensby et al. (2012) found little evidence on the period after the return, calling for studies that follow people once they are back. The case for monitoring is a reasoned one rather than a tested one.

Organizations that set an accommodation plan and never revisit it are not providing inadequate accommodation by intent. They are providing it by neglect.

What Happens When Accommodation Fails

The consequences of inadequate accommodation are not limited to longer claims.

Mustard et al. (2024) split separations by whether workers put them down to their health. Health-related separation (RR 2.72) is the expected outcome: the employee’s health does not recover enough to sustain employment, and the accommodation failure contributes. But separations not related to health were also more likely after inadequate accommodation (RR 1.68). The study does not record what lay behind them beyond whether the worker chose to go or the job was ended for them, and inadequate accommodation was tied more strongly to the second (RR 2.18) than the first (RR 1.45). One likely reading is that the accommodation experience damaged the employment relationship.

If that is right, this second pathway is where the hidden cost lives. The employee could have returned. But the accommodation process was so poorly executed, so delayed, so mismatched to their needs, that they chose to leave or were managed out.

No diagnosis code captures this. No treatment plan addresses it. It is an organizational outcome, and accommodation quality is part of it.

Multi-Component Programmes Produce the Strongest Evidence

The most consistent finding in the return-to-work reviews is that programmes combining several kinds of intervention have stronger evidence behind them than single interventions do.

Cullen et al. (2018) synthesised 36 medium- and high-quality studies and found strong evidence that interventions spanning at least two of three domains — health-focused care, service coordination and work modification — reduced time away from work for both musculoskeletal and mental health conditions. Most single-domain interventions had mixed or limited evidence. For mental health conditions, cognitive behavioural therapy without a workplace component had strong evidence that it does not help people return to work.

What does “multi-component” mean in practice? The workplace programmes Gensby et al. (2012) reviewed typically combined early contact, modified duties or schedules, education of workplace staff and a return-to-work coordinator. The combination recommended here builds on that:

• Early contact and accommodation planning (not delayed until medical clearance)

• Supervisor training on communication and accommodation execution

• RTW coordination connecting workplace, healthcare, and benefits

• Ongoing monitoring with adjustment authority

On this evidence, single interventions, however well designed, are unlikely to make up for the missing components. An ergonomic workstation modification does not help when the supervisor relationship is broken. Supervisor training does not help when no one assesses the psychosocial factors driving claim complexity.

What This Means for Your Organization

If your disability management process assesses diagnosis and treatment but not accommodation quality, you are missing a variable that strongly predicts whether people stay.

The fix is not more clinical assessment. It is systematic measurement of accommodation quality across the five dimensions set out here: timeliness, adequacy of match, worker involvement, supervisor capability, and ongoing monitoring.

That measurement requires infrastructure. It requires a system that scores accommodation quality, connects it to case outcomes, identifies where quality is failing, and provides the training and tools to improve it.

The diagnosis does not settle whether someone returns to work and stays. The accommodation experience has a large say in it.

References

Cullen KL, Irvin E, Collie A, et al. Effectiveness of workplace interventions in return-to-work for musculoskeletal, pain-related and mental health conditions: an update of the evidence and messages for practitioners. Journal of Occupational Rehabilitation. 2018;28(1):1-15. doi:10.1007/s10926-016-9690-x

Franche RL, Cullen K, Clarke J, et al. Workplace-based return-to-work interventions: a systematic review of the quantitative literature. Journal of Occupational Rehabilitation. 2005;15(4):607-631. doi:10.1007/s10926-005-8038-8

Gensby U, Lund T, Kowalski K, et al. Workplace disability management programs promoting return to work: a systematic review. Campbell Systematic Reviews. 2012;8(1). doi:10.4073/csr.2012.17

Jessiman-Perreault G, Smith P, Thompson A, et al. The relationship between meeting workplace accommodation needs and job disruptions among Canadians working with disabilities: a cross-sectional analysis. Journal of Occupational and Environmental Medicine. 2025;67(1):e54-e60. doi:10.1097/JOM.0000000000003262

Kools L, Koning P. Graded return-to-work as a stepping stone to full work resumption. Journal of Health Economics. 2019;65:189-209. doi:10.1016/j.jhealeco.2019.03.009

Mustard CA, Orchard C, Dobson KG, et al. The adequacy of workplace accommodation and the incidence of permanent employment separations after a disabling work injury or illness. Scandinavian Journal of Work, Environment & Health. 2024;50(3):208-217. doi:10.5271/sjweh.4149

Nevala N, Pehkonen I, Koskela I, et al. Workplace accommodation among persons with disabilities: a systematic review of its effectiveness and barriers or facilitators. Journal of Occupational Rehabilitation. 2015;25(2):432-448. doi:10.1007/s10926-014-9548-z

Shaw WS, Robertson MM, McLellan RK, et al. A controlled case study of supervisor training to optimize response to injury in the food processing industry. Work: A Journal of Prevention, Assessment & Rehabilitation. 2006;26(2):107-114. doi:10.3233/WOR-2006-00498