Epidemiologic Methods ; Humans ; Population Surveillance ; Public Health

OBJECTIVETo explore relationships among several capture-recapture methods to be used in injury studies.

METHODSComparing the method on the estimation number of missed cases with supergeometric distribution and proportional methods and study the relationship between the three methods.

RESULTSResults from estimation method for number of missed cases and supergeometric distribution were identical while the formula of estimation method for number of missed cases could be induced from one of supergeometric distribution formula. The distribution of injured population did not belong to the negative binomial distribution. The estimation range was not the same between proportional method and supergeometric distribution.

CONCLUSIONSEither supergeometric distribution or estimation method for number of missed cases could be chosen, but the former was simple in calculation. Considering the estimating range was not the same between supergeometric distribution and proportional method, conditions for application must be considered during implementation.

Epidemiologic Methods ; Humans ; Population Surveillance ; Wounds and Injuries ; prevention & control

Chronic Disease ; prevention & control ; Humans ; Population Surveillance ; methods

Communicable Diseases ; epidemiology ; Disease Outbreaks ; Humans ; Population Surveillance ; methods

HIV Infections ; epidemiology ; Humans ; Population Surveillance ; methods ; World Health Organization

China ; Disease Notification ; Online Systems ; Population Surveillance ; methods ; Quality Control

OBJECTIVETo evaluate the abilities of population-based birth defects surveillance system (PBBDSS) and hospital-based birth defects surveillance system(HBBDSS).

METHODSWe used capture-mark-recapture method(CMR) to analyze the data of the two kinds of birth defects surveillance systems from 1 Oct. 2006 to 31 Dec. 2006 in a county of Hunan province. Data from PBBDSS were defined as the first source and data from HBBDSS were defined as the second source.

RESULTS49 and 28 birth defect cases were found from PBBDSS and from HBBDSS respectively. Among these cases, 20 were marked. With the method of CMR, the estimated birth defects cases were 68 (95% CI: 56-70). The coincident rates of PBBDSS and HBBDSS were 72.1% and 41.2%, while the total coincident rates was 83.8% and the coincident rates from different sources was 57.1%. The unreported rates of PBBDSS and HBBDSS were 27.9% and 58.8%.

CONCLUSIONNot only the HBBDSS but also the PBBDSS appeared to have had high unreported rates, suggesting that we could use CMR to adjust the rate of birth defects from the birth defects surveillance data.

Congenital Abnormalities ; diagnosis ; epidemiology ; Humans ; Infant, Newborn ; Population Surveillance ; methods

Comet Assay ; DNA Damage ; Humans ; Occupational Exposure ; Population Surveillance ; methods

Population-based lifetime health services rely on health management practice. Collection, management and analysis of big data are highly suitable for the huge population base in China. Nowadays, more and more research focus on the methods, security and ethnicity of health management and big data, and a plenty of instructive results have been made, which could be used to guide the future practice and development. Yichang mode has set a precedent for construction and use of big data for health management.
Big Data ; China ; Delivery of Health Care ; Health Services Research ; Population Health Management ; Population Surveillance/methods*

OBJECTIVETo investigate the application of prospective space-time scan statistic in the early stage of detecting infectious disease outbreaks.

METHODSThe prospective space-time scan statistic was tested by mimicking daily prospective analyses of bacillary dysentery data of Chengdu city in 2005 (3212 cases in 102 towns and villages). And the results were compared with that of purely temporal scan statistic.

RESULTSThe prospective space-time scan statistic could give specific messages both in spatial and temporal. The results of June indicated that the prospective space-time scan statistic could timely detect the outbreaks that started from the local site, and the early warning message was powerful (P = 0.007). When the merely temporal scan statistic for detecting the outbreak was sent two days later, and the signal was less powerful (P = 0.039).

CONCLUSIONThe prospective space-time scan statistic could make full use of the spatial and temporal information in infectious disease data and could timely and effectively detect the outbreaks that start from the local sites. The prospective space-time scan statistic could be an important tool for local and national CDC to set up early detection surveillance systems.

China ; Communicable Disease Control ; methods ; Communicable Diseases ; epidemiology ; Humans ; Models, Statistical ; Population Surveillance ; methods ; Prospective Studies