[Study on clustering of Yunnan unexplained sudden death in household and village].
OBJECTIVE
To discuss the clustering of Yunnan unexplained sudden death (YUSD) in household and village.


METHODS
Fifty-two cases were found by YUSD surveillance system in 2005. Poisson distribution and beta-binomial distribution (BBD) were employed in studying the household distribution of the disease. Poisson distribution and negative binomial distribution (NBD) were employed in studying the village distribution of the disease.


RESULTS
BBD were fitted household distribution of YUSD very well (chi(2) = 0.25, P = 0.62), while Poisson distribution was consistent with it (chi(2) = 46.01, P < 0.001). And NBD were fitted village distribution of YUSD very well (chi(2) = 0.05, P = 0.58), however the consistency in Poisson distribution was not observed (chi(2) = 110.57, P < 0.001).


CONCLUSIONS
Household and village clustering of YUSD does exist.
Ren
Jin-Ma
JM
Chinese Center for Disease Control and Prevention, Beijing 100050, China.
Zhao
Yan-Rong
YR
Huang
Wen-Li
WL
Zhang
Jian
J
Shen
Tao
T
Xie
Xu
X
Cai
Jian
J
Yang
Lin
L
Cehn
Feng
F
Zeng
Guang
G
D015982:Bias; D016010:Binomial Distribution; D002423:Cause of Death; D002681:China / Q000453:epidemiology; D003645:Death, Sudden / Q000453:epidemiology*; D005190:Family; D006801:Humans