Table 3. Crude and age-standardized mortality (1/100,000) of Alzheimer 's disease and other forms of dementia in different areas, China, 2009–2015.

Year	urban		rural		χ2	P
	mortality	age-standardized	mortality	age-standardized
2009	3.28	3.57	3.11	5.02	80.866	<0.001
2010	3.48	4.40	3.69	6.00	88.629	<0.001
2011	3.31	4.49	4.01	5.23	20.777	<0.001
2012	3.48	3.25	4.49	4.26	49.502	<0.001
2013	4.41	3.48	4.81	4.34	86.651	<0.001
2014	4.23	3.46	4.66	3.86	23.583	<0.001
2015	4.40	3.59	4.89	4.06	31.141	<0.001
total	4.03	3.58	4.52	4.20	231.034	<0.001
χ2	—	32.334	—	402.737	—	—
P	—	<0.001	—	<0.001	—	—