I'm interested in knowing the incidence of the following
disease/impairments/risk factors amongst elderly (aged 65 and over) in
the People's Republic of China:
 1) Sight-impaired
 2) Depression
 3) Hypertension
 4) Parkinson's 

Up-to-date figures please (2005 preferred) - please express as a % of
the total population aged 65+, e.g. "12.3% of Chinese population aged
65+ are sight-impaired". Please cite sources and likely quality of
data.

If figures for wider population of PRC (i.e. % of total population
with 1, 2, 3 and 4) are easily available and supplied, will tip well
(25%).

PRC-based answerer preferred, failing that a native speaker would be great.

Thanks