Risk Factor		Number of Patients with AD	Total People
ApoE	ε2, ε3	414	1648
ApoE	ε4	161	1606
Educational level	Junior high school or above	367	10,522
Educational level	Illiterate and junior high school or below	1204	13,415
Gender	Male	647	10,307
Gender	Female	869	10,471
History of smoking	Never smoke	446	2977
History of smoking	Smoking over three weeks	1240	9278
Drinking history	Never drink	438	1272
Drinking history	Drinking over three weeks	3680	13,346
Negative life event	No negative life events	25	115
Negative life event	Negative life event	53	111
Family history of dementia	No history of dementia in the family	138	1232
Family history of dementia	Dementia patients in immediate family members	81	10,020
Brain trauma	No brain trauma	13,340	1,970,599
Brain trauma	The head has been hit hard	5909	166,054
Diabetes	No diabetes	418	3588
Diabetes	Have diabetes	490	3419