Incidence rate ratios of motorcycle crash‐related hospitalizations within 1 year of dementia diagnosis in younger adults: A nationwide population‐based study in Taiwan

Abstract

AbstractBackgroundThe cognitive impairment and motor deficiency due to dementia may adversely affect the ability and skill related to ride motorcycle. However, little information regarding the incidence and risk of motorcycle crash‐related hospitalizations among patients with dementia. This study estimates the incidence rate ratios (IRR) of motorcycle crash‐related hospitalizations between first‐diagnosed dementia and non‐dementia.MethodIn this retrospective population‐based cohort study, we compared dementia aged 40‐64 years and its age‐ and sex‐ matched subjects without dementia from the Taiwan National Health Insurance Research Database entries and Taiwan Police‐reported Traffic Accident Registry between 2006 and 2015. The incidence of motorcycle crash‐related hospitalizations was compared between first‐diagnosed dementia and non‐dementia cases using IRR, stratified by age, sex, and charlson index. The incidence densities of motorcycle crash‐related hospitalizations were estimated based on Poisson assumption.ResultOver 1‐year of follow‐up, the incidence densities of motorcycle crash‐related hospitalizations were 29.73 and 10.46 per 10,000 person‐years for subjects with and without dementia, respectively, with an IRR of 2.84 (95% CI 1.99 to 4.06). Regardless of any age, sex or charlson index, the incidence densities of motorcycle crash‐related hospitalizations were higher in patients with dementia than subjects without dementia, with the IRR ranging from 1.07 (95% CI 0.49 to 2.37) to 7.06 (95% CI 2.48 to 20.14). Unlike subjects without dementia, the incidence density of motorcycle crash‐related hospitalizations decreased with age among patients with dementia. Among them, the highest IRR was 7.06 (95% CI 2.48 to 20.14) in those aged 40‐44. In gender group, the IRR of motorcycle crash‐related hospitalizations were higher in male (3.34, 95% CI 2.07 to 5.38) than in female (2.27, 95% CI 1.32 to 3.89). The effect of dementia on incidence rate of motorcycle crash‐related hospitalizations were highest in those without comorbidities (IRR 4.17, 95% CI 2.74 to 6.36).ConclusionYounger adults with dementia may rise the risk of motorcycle crash‐related hospitalizations within 1 year after diagnosis compared to those without dementia, which suggests the reinforcement transport safety in younger adults with dementia is needed.