Prevalence and prognosis of schizophrenia in Jinuo people in China: a prospective 30-year follow-up study.
BACKGROUND
There are few studies investigating the influence of the development on mental health of minorities in China.


OBJECTIVE
To follow up the prevalence, natural course and prognosis of schizophrenia in Jinuo people, the last group to be recognized as a 'national minority' in China, every 10 years since 1979.


METHODS
From 1979 to 2009, 15%-19% of Jinuo residents were evaluated by random cluster sampling and followed up every 10 years using the Chinese version of the Composite International Diagnostic Interview (CIDI) as the screening tool and the International Classification of Diseases (ICD) as diagnostic criteria tool.


RESULTS
There were no significant differences for the lifetime prevalence and current prevalence of schizophrenia across the three decades. Neither were there any significant differences for the prognosis of schizophrenia; however, at least half the patients had deteriorated or had residual symptoms in the follow-up. PANSS symptoms were significantly different according to different illness duration.


CONCLUSIONS
During the three decades, there was no increasing trend for schizophrenia prevalence in Jinuo society; however, the prognosis of schizophrenia was not optimistic. In the natural, untreated status, schizophrenia patients with an illness duration of more than 20 years had more serious symptoms.
Department of Clinical Psychology, The Second People's Hospital of Yunnan Province, Kunming Yunnan, China Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong jzhyang2004@163.com.
JianZhong
J
Yang
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
ChuanYuan
C
Kang
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
Yong
Y
Zeng
Yunnan Institute of Drug Abuse, Kunming Yunnan, China.
JianHua
J
Li
Department of Clinical Psychology, The Second People's Hospital of Yunnan Province, Kunming Yunnan, China.
PeiKai
P
Li
Yunnan Institute of Drug Abuse, Kunming Yunnan, China.
WenPeng
W
Wan
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
XuDong
X
Zhao
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
WanJun
W
Guo
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
XiuFeng
X
Xu
Department of Clinical Psychology, The Second People's Hospital of Yunnan Province, Kunming Yunnan, China.
XiaoBin
X
Yang
Department of Psychiatry, The First Affiliate Hospital of Kunming Medical University, Kunming Yunnan, China.
QiuYuan
Q
Li
Department of Clinical Psychology, The Second People's Hospital of Yunnan Province, Kunming Yunnan, China.
XiaoYan
X
Liu
Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong.
Sung-Chan
SC
Pauline
D002681:China / Q000453:epidemiology; D005006:Ethnicity / Q000523:psychology / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D008913:Minority Groups / Q000523:psychology / Q000706:statistics & numerical data; D015995:Prevalence; D011379:Prognosis; D011446:Prospective Studies; D012559:Schizophrenia / Q000175:diagnosis / Q000453:epidemiology* / Q000628:therapy
Jinuo people; Schizophrenia; follow-up study; prevalence