Table 2.

Risk of dementia according to continuity of physical activity

	Never-PA (n = 99,873)	Initiation-PA (n = 45,598)	Withdrawal-PA (n = 45,014)	Maintenance-PA (n = 56,664)
DAT cases, n (%)	8658 (8.7%)	2888 (6.3%)	3445 (7.7%)	2742 (4.8%)
DAT incidence (per 1000 person-years)	33.25	24.11	29.13	18.77
Unadjusted HR (95% CI)
DAT	1 (ref)	0.73 (0.70–0.76)	0.88 (0.84–0.91)	0.56 (0.54–0.59)
Adjusted HR* (95% CI)
DAT	1 (ref)	0.89 (0.85–0.93)	1.00 (0.96–1.04)	0.82 (0.79–0.86)

HR hazard ratio, CI confidence interval, DAT dementia of the Alzheimer type, PA physical activity

*Adjusted for age, gender, hypertension, diabetes mellitus, dyslipidemia, body mass index, history of smoking, and history of alcohol intake