Japan's universal health insurance system ensures that hospital stays are decided solely by medical necessity rather than financial constraints. However, the system imposes standardized lengths of stay, with hospitals facing reduced insurance payments for delays beyond these standards. This incentivizes careful management of non-medical factors extending hospital stays, such as those caused by accidents. One focus is the rehabilitation programs in Convalescent Rehabilitation Wards (CRWs), designed to address this issue. This study aimed to investigate the relationship between the progression of grip strength over time and the frequency of incidents occurring post-discharge from bedridden states.
The research, conducted from June 1 to August 30, 2023, in a 200-bed hospital ward found in suburban Japan, was a cross-sectional and observational study. Participants were adult patients admitted within one week of hospitalization, who consented to take part, excluding those with conditions making medical measurements challenging, significant visual or vestibular dysfunction, or scoring below 10 on the Revised Hasegawa's Dementia Scale.
Recruitment involved obtaining approval from the hospital director and finding eligible patients through physical therapists at the hospital. The study analyzed data from 41 of 42 participants, including one exclusion due to ill health. The analysis adhered to the intent-to-treat principle, including all participants with missing data. Participants formed sixteen with general orthopedic diseases, twelve with spinal disorders, eight with cerebrovascular diseases, four with disuse syndrome, and one with other conditions, totaling twenty-eight women and thirteen men.
Results showed significant differences in grip strength achievement times between genders, with women reaching largest grip strength faster than men on average. After excluding an outlier with a 16-second largest grip strength achievement time, the significant difference disappeared, showing that, on average, women reached largest grip strength quicker than men. The study concluded that using largest grip strength achievement time as a metric could significantly differentiate between the potential for incidents, suggesting its clinical utility.
The cutoff point in time to reach maximum grip strength was 2.54 seconds for females and 4.23 seconds for males, which was significantly shorter for females. The AUC of the time to reach maximum grip strength exceeded 0.72 in discriminating incident accidents and was superior to the estimation of the frequency of grasping accidents based on grip strength information alone.
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