[Association of rehabilitation time with activities of daily living using data from a hospital bed function report system].

Objectives　The main purpose of rehabilitation is to improve the activities of daily living (ADL). Although convalescent wards are required to provide intensive rehabilitation to patients to improve their ADL, they have not been verified sufficiently. With a focus on the rehabilitation time, this study investigated the association of the amount of rehabilitation with ADL using a complete enumeration survey of a hospital bed function report system.Methods　This retrospective cohort study focusing on convalescent wards nationwide was conducted using the panel data from hospital bed function reports between 2014 and 2017. We used a fixed effects regression analysis with the improvement rate of ADL as the outcome measure and the number of rehabilitation units as the exposure variable.Results　The study sample included 2,003 wards, which were identified as having convalescent care functions from the report in 2014; a total of 437 wards (317 hospitals) were analyzed. The mean annual improvement rates of ADL were 0.601, 0.613, and 0.627 points in 2014, 2015, and 2017, respectively. The mean annual numbers of rehabilitation units provided were 6.302, 6.477, and 6.642 units in 2014, 2015, and 2017, respectively. The panel data analysis showed that the improvement rate of ADL was associated with an increase in the number of rehabilitation units (coefficient for an increase of one unit: 0.015, P=0.015).Conclusion　In the study of ward units using a national-level survey, a longer rehabilitation time was significantly associated with improvements in ADL.