Impact of sensory impairments on dementia incidence and symptoms among Japanese older adults
Corresponding Author
Michio Maruta
Department of Rehabilitation, Medical Corporation, Sansyukai, Okatsu Hospital, Kagoshima, Japan
Correspondence: Michio Maruta, OTR, MS, Department of Rehabilitation, Medical Corporation, Sansyukai, Okatsu Hospital, 3-95, Masagohonmachi, Kagoshima 890-0067, Japan. Email: [email protected]Search for more papers by this authorTakayuki Tabira
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
Search for more papers by this authorAkira Sagari
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Shinshu University, Nagano, Japan
Search for more papers by this authorHironori Miyata
Faculty of Health Science, Department of Rehabilitation, Division of Occupational Therapy, Kumamoto Health Science University, Kumamoto, Japan
Search for more papers by this authorKoji Yoshimitsu
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
Search for more papers by this authorGwanghee Han
Department of Neuropsychiatry, Kumamoto University Hospital, Kumamoto, Japan
Search for more papers by this authorKazuhiro Yoshiura
Department of Neuropsychiatry, Kumamoto University Hospital, Kumamoto, Japan
Search for more papers by this authorTakashi Matsuo
Faculty of Rehabilitation Sciences, Nishikyusyu University, Saga, Japan
Search for more papers by this authorMasahiro Kawagoe
Graduate Course of Health and Social Services, Saitama Prefectural University, Saitama, Japan
Search for more papers by this authorCorresponding Author
Michio Maruta
Department of Rehabilitation, Medical Corporation, Sansyukai, Okatsu Hospital, Kagoshima, Japan
Correspondence: Michio Maruta, OTR, MS, Department of Rehabilitation, Medical Corporation, Sansyukai, Okatsu Hospital, 3-95, Masagohonmachi, Kagoshima 890-0067, Japan. Email: [email protected]Search for more papers by this authorTakayuki Tabira
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
Search for more papers by this authorAkira Sagari
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Shinshu University, Nagano, Japan
Search for more papers by this authorHironori Miyata
Faculty of Health Science, Department of Rehabilitation, Division of Occupational Therapy, Kumamoto Health Science University, Kumamoto, Japan
Search for more papers by this authorKoji Yoshimitsu
Department of Occupational Therapy, School of Health Sciences, Faculty of Medicine, Kagoshima University, Kagoshima, Japan
Search for more papers by this authorGwanghee Han
Department of Neuropsychiatry, Kumamoto University Hospital, Kumamoto, Japan
Search for more papers by this authorKazuhiro Yoshiura
Department of Neuropsychiatry, Kumamoto University Hospital, Kumamoto, Japan
Search for more papers by this authorTakashi Matsuo
Faculty of Rehabilitation Sciences, Nishikyusyu University, Saga, Japan
Search for more papers by this authorMasahiro Kawagoe
Graduate Course of Health and Social Services, Saitama Prefectural University, Saitama, Japan
Search for more papers by this authorAbstract
Background
Dementia and behavioural and psychological symptoms of dementia affect older adults' care-need levels. With aging comes an increase in the incidence of sensory impairments, which promotes the development of dementia. We investigated the association between sensory impairments – visual impairment (VI), hearing impairment (HI), and dual sensory impairment (DSI), the behavioural and psychological symptoms of dementia, and dementia incidence.
Methods
This was a retrospective study that used Japanese long-term care insurance certification data from 2010 to 2017 of City A. The 2190 older adults who did not have dementia in 2010 were classified into four impairment categories: VI, HI, DSI, and no sensory impairment. The incidence of dementia was examined using Kaplan–Meier survival analysis and log-rank testing. Cox proportional hazards analysis was used to investigate the risk of developing dementia associated with sensory impairments, compared to the risk for no sensory impairment. Pearson's χ2 tests were used to compare the prevalence of behavioural and psychological symptoms of dementia among the four groups.
Results
HI and DSI were associated with a higher cumulative dementia incidence compared to no sensory impairment (log-rank χ2 = 10.42; P < 0.001, and log-rank χ2 = 39.92; P < 0.001, respectively), and DSI showed higher cumulative dementia incidence than HI (log-rank χ2 = 11.37; P = 0.001). Cox proportional hazards analysis showed that DSI is the greatest risk factor for developing dementia among sensory impairments (hazard ratio, 1.45; 95% CI, 1.22–1.71; P < 0.001). Older adults with VI had a significantly higher prevalence of day-night reversal than the other groups.
Conclusions
Our results indicate that older adults with sensory impairments have a high incidence of dementia, with DSI presenting the greatest risk. Older adults with VI were found to be more likely to have day-night reversal symptoms when dementia occurs.
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