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

Table 4

Incidence rate of ND stratified by age group in control and T2D groups.

Age range	Control		T2D
	No. of ND	Rate	No. of ND	Rate	IRR^†	95% CI
All age	44,673	36.89	51,096	44.68	1.21	1.20~1.23
65~69	11,003	22.78	13,872	29.46	1.29	1.26~1.33
70~74	14,041	35.58	16,887	44.80	1.26	1.23~1.29
75~79	11,442	53.30	12,244	63.75	1.20	1.17~1.23
80 ≤	8,187	69.05	8,093	77.97	1.13	1.10~1.16

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