[Establishment of early warning control charts based on the syndromic surveillance data of outpatient diarrhea in Beijing].

OBJECTIVE: To establish the control charts for early warning of diarrhea based on the syndromic surveillance data from enteric clinic in Beijing. METHODS: The outpatient data from enteric clinic of a Grade Three General hospital in Haidian district, Beijing from April 1 to Oct. 31, 2009 and from May 1 to Nov.10, 2010 were collected, according to the moving average method, the baseline calculated, the value of probability α and µα, the early warning value based on the formula "w=Xj+µαSj" calculated and the early warning control charts drew at last. RESULTS: According to the harmfulness, the severity and controllability of diarrheal diseases, the value of probability α was determined as 0.01, then µα (unilateral) as 2, based on the early warning value, the control charts of diarrheal diseases, bacillary dysentery and other infectious diarrhea were established. CONCLUSION: The enteric clinic requires to further collect baseline data to evaluate and continuously adjust the established control charts for the best early warning model in accordance with the enteric clinic.