Risk of Neurodegenerative Diseases in Elderly Koreans with an Initial Diagnosis of Type 2 Diabetes: A Nationwide Retrospective Cohort Study

Table 3

Person-years incidence rates of ND at 2-year intervals during the 10-year follow-up period.

Group	Person-years	No. of ND	Rate	95% CI
Control
0-2	303,152.33	5,841	19.27	18.78~19.77
2-4	276,270.47	7,848	28.41	27.79~29.04
4-6	244,807.13	8,924	36.45	35.70~37.22
6-8	210,789.92	10,781	51.15	50.19~52.12
>8	175,914.46	11,279	64.12	62.94~65.31
T2D
0-2	300,778.76	7,528	25.03	24.47~25.60
2-4	267,524.36	9,547	35.69	34.98~36.41
4-6	230,141.37	10,357	45.00	44.14~45.88
6-8	191,354.26	12,048	62.96	61.85~64.10
>8	153,868.70	11,616	75.49	74.13~76.88
Total	2,354,601.76	95,769	40.67	40.42~40.93

Rate means incidence rate (per 1000 person-years). ND: neurodegenerative disease; CI: confidence interval; T2D: type 2 diabetes.