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Research involving more than 1,000 facilities highlights the importance of direct-care staffing in improving resident outcomes, as Japan develops a more systematic approach to monitoring long-term care quality.
Higher staffing levels in Japanese nursing homes are associated with fewer pressure ulcers among residents, according to a new study published in Aging and Health Research in September 2026. The findings highlight the relationship between workforce capacity and care quality, offering evidence for policymakers and operators facing growing pressure to maintain standards amid labour shortages.
The study, titled Nursing Home Staffing and Quality: Evidence From Japan, was conducted by researchers Karen Eggleston, Toshiaki Iizuka, Yong Suk Lee, Shirley Cai, Rosina Lin and Carter Nakamoto. It draws on survey data from more than 1,000 Japanese nursing homes collected in 2020, 2022 and 2024, linked with administrative records.
The researchers examined two indicators of care quality: pressure ulcers and the use of physical restraints. Their analysis also accounted for differences in facility characteristics and residents’ care needs, helping to distinguish the relationship between staffing and outcomes from other factors that may influence care quality.
More Direct-Care Staff, Fewer Pressure Ulcers
The central finding was that facilities with more full-time-equivalent (FTE) direct-care staff per resident reported fewer pressure ulcers.
In the baseline analysis, an increase of one direct-care worker FTE was associated with 2.74 fewer patient ulcers. When staff turnover was additionally included in the analysis, the estimated association increased to 3.17 fewer ulcers.
The researchers also examined different categories of personnel. Increases in the FTE numbers of care workers and nurses were separately associated with fewer pressure ulcers, suggesting that both groups contribute to resident care outcomes.
Pressure ulcers are an important indicator in long-term care because their prevention requires consistent attention to residents’ daily needs, including repositioning, skin care and monitoring. The findings therefore point to the potential value of adequate staffing in supporting routine preventive care.
However, the study identifies an association rather than proving that additional staff directly cause fewer pressure ulcers. The results should not be interpreted as establishing a specific staffing ratio or guaranteeing the same improvement across all facilities.
Staffing Alone Does Not Explain Restraint Use
The second quality indicator produced a different result. Researchers found no statistically significant relationship between staffing levels and the use of physical restraints.
This suggests that staffing capacity may influence some aspects of care quality more clearly than others. Restraint practices can also be shaped by facility policies, staff training, resident conditions and approaches to dementia care. The study does not establish which factors explain the absence of a significant staffing relationship.
Implications for Japan’s Long-Term Care Sector
The research comes as Japan faces mounting pressure on its direct-care workforce from a declining working-age population and increasing numbers of older adults requiring support. Policymakers are also seeking to develop a more systematic national framework for monitoring nursing-home quality.
For operators, the findings reinforce the importance of workforce planning, staff retention and maintaining sufficient care-worker and nursing capacity. They also suggest that staffing data could be considered alongside resident outcomes when evaluating facility performance.
As Japan strengthens its long-term care quality-monitoring system, the study provides a useful evidence base for connecting workforce resources with measurable care indicators. Its broader message is that addressing staffing pressures is not only a matter of keeping facilities operational, but also an important consideration in maintaining the quality of care delivered to older residents.
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