[The prevalence of mild cognitive impairment among residents aged 55 or over in Chengdu area].
OBJECTIVE
To study the prevalence of mild cognitive impairment (MCI) in the urban and the rural areas in Chengdu, Southwest China.


METHODS
Residents aged 55 or over were selected by stratified random cluster sampling from 19 districts, cities, and counties of Chengdu area in Sichuan province. A two-stage survey was carried out. In the first stage, CMMSE, CES-D were used as screening instruments. In the second stage, Diagnostic questionnaires of dementia and CDR were used as diagnostic instruments. The diagnostic criteria of mild cognitive impairment adopted from Petersen's were: (1) memory complaint; (2) normal activities of daily living; (3) normal general cognitive function; (4) memory impairment incompatible with age; (5) not demented; (6) CDR = 0.5 and (7) exclusion of the reversible cognitive impairment caused by other factors (i.e. depression).


RESULTS
Three thousand, nine hundred and ten subjects were examined. The prevalence rates of MCI was 2.4%. The MCI prevalence rates in the urban and the rural areas were 1.5%, 2.5% respectively, without significant difference. The MCI prevalence in males and females were 1.8%, 2.9% respectively. Prevalence rate in female was higher than in males with significant difference. Prevalence of illiteracy (4.0%) was the highest among different educational levels. The accumulated prevalence increased with age.


CONCLUSIONS
The prevalence of MCI (2.4%) was slightly higher than the prevalence of AD (2.05%) in the same areas of Chengdu. MCI seemed to be a high risk factor for AD which should to be followed up. Early intervention in MCI might be helpful in the prevention of AD.
Qiu
Chang-jian
CJ
Institute of Mental Health, Huaxi Hospital, Sichuan University, Chengdu 610041, China.
Tang
Mu-ni
MN
Zhang
Wei
W
Han
Hai-ying
HY
Dai
Jing
J
Lu
Jiang
J
Wu
Sai
S
Wang
Shuang-hong
SH
Chen
Jian-min
JM
Guo
Lin-jin
LJ
Ding
Yu-qiong
YQ
Li
Sheng-xian
SX
Liu
Xie-he
XH
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D003072:Cognition Disorders / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011897:Random Allocation; D012111:Residence Characteristics / Q000706:statistics & numerical data; D012307:Risk Factors; D012737:Sex Factors; D012923:Social Class