Incidence and mortality of spontaneous subarachnoid hemorrhage in Hong Kong from 2002 to 2010: a Hong Kong hospital authority clinical management system database analysis.
BACKGROUND
Ninety-five percent of the Hong Kong population is Chinese, and no previous epidemiological study has focused on spontaneous subarachnoid hemorrhage (SAH) in Hong Kong. These data would have significant public health implications and can guide future resource allocations and service development in Hong Kong. The aim of this study was to investigate the local incidences of spontaneous SAH and 1-year mortality rates in Hong Kong, with the respective time trends in recent years.


METHODS
Data from the Clinical Management System database of the Hong Kong Hospital Authority were used to examine the incidence of SAH and 1-year mortality rates among the Hong Kong population for the 2002-2010 period. Age-standardized incidence rates were calculated by the direct method using the standard population given in World Health Organization World Standard Population 2000-2025.


RESULTS
Crude SAH incidences increased from 5.5 per 100,000 person-years in 2002 to 7.5 in 2010. Standardized SAH incidences increased from 4.1 per 100,000 person-years in 2002 to 5.6 in 2010. Crude 1-year mortality rates decreased from 43% in 2002 to 19% in 2010, and the standardized 1-year mortality rate decreased from 38% in 2002 to 19% in 2010.


CONCLUSIONS
The Hong Kong SAH incidence was 7.5 per 100,000 person-years in 2010, and an increasing trend over time was noted. The 1-year mortality rates decreased from 43% in 2002 to 19% in 2010, in accordance with the worldwide trend.
Division of Neurosurgery, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong. Electronic address: georgewong@surgery.cuhk.edu.hk.
George Kwok Chu
GK
Wong
Division of Neurosurgery, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong.
Yvonne Yik
YY
Wun Tam
Division of Neurosurgery, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong.
Xian Lun
XL
Zhu
Division of Neurosurgery, Department of Surgery, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong.
Wai Sang
WS
Poon
D000293:Adolescent; D000328:Adult; D000368:Aged; D044466:Asian People / Q000706:statistics & numerical data*; D002648:Child; D002675:Child, Preschool; D016208:Databases, Factual / Q000706:statistics & numerical data*; D005260:Female; D006723:Hong Kong / Q000453:epidemiology; D006761:Hospitals / Q000706:statistics & numerical data; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009026:Mortality / Q000208:ethnology / Q000639:trends; D013345:Subarachnoid Hemorrhage / Q000208:ethnology / Q000401:mortality*; D055815:Young Adult
Chinese; Hong Kong; Incidence; Mortality; Subarachnoid hemorrhage