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Table 4 Dementia incidence according to hemodialysis duration

From: Is hemodialysis itself a risk factor for dementia? An analysis of nationwide registry data of patients on maintenance hemodialysis in Japan

Hemodialysis duration (year) Non-diabetic patients Diabetic patients
Number of patients Person-years Number of patients who developed dementia Incidence rates of dementia (cases/1000 person-year) Number of patients Person-years Number of patients who developed dementia Incidence rates of dementia (cases/1000 person-year)
   (95% CI)     (95% CI)  
01 14,787 14,452.5 669 46.3 ( 42.9 49.9 ) 12,756 12,500.0 512 35.8 ( 32.9 39.1 )
24 17,293 16,952.5 681 40.2 ( 37.3 43.3 ) 13,342 13,053.0 578 39.1 ( 36.1 42.4 )
59 19,984 19,684.5 599 30.4 ( 28.1 33.0 ) 10,273 10,085.5 375 32.2 ( 29.1 35.6 )
1014 12,479 12,336.5 285 23.1 ( 20.6 25.9 ) 2785 2736.5 97 30.1 ( 24.7 36.8 )
1519 7452 7398.0 108 14.6 ( 12.1 17.6 ) 605 593.0 24 34.5 ( 23.1 51.4 )
2024 4138 4109.0 58 14.1 ( 10.9 18.3 ) 98 96.0 4 34.9 ( 13.1 93.1 )
25 4074 4054.5 39 9.6 ( 7.0 13.2 ) 35 34.0 2 50.6 ( 12.7 202.5 )
Total 80,207 78,987.5 2439 30.9 ( 29.7 32.1 ) 39,894 39,098.0 1592 35.5 ( 33.8 37.3 )
  1. Incidence rate of dementia (cases/1000 person-years) = the number of patients with newly developed dementia during the observation period (cases)/the total person-years of the target patients during the observation period (person-years) × 1000. The length of follow-up for patients with dementia was assumed to be 0.5 years
  2. CI confidence interval