period prevalence
1.Results: 39 patients were diagnosed as affective disorders, and 26 of them were in illness period, with a life-time prevalence of 1.17‰ and a time-point prevalence of 0.78‰.
3.Methods To investigate the basic prevalence situation bef ore the infection season,and examine the people by the methods of kato-katz and hatching in the early period of flood,flood period and later period of flood respectively in the flood year. To calculate the infection rate and infectiosity.
4.Using the collected dynamic data of 1963～1991 in a natural plague focus of Spermophilus dauricusalaschanicus. a grey calamity forecasting model GM(1,1) was modeled to forecast the prevalence of this epizootic plague, and the possible years of the next epizootic/epidemic period were thus given.
5.Results The prevalence of congenital malformation in infants born to mothers who had hyperthyroidism during pregnancy (6.9%, 7/101) was significantly higher than that of all the infants born in the same hospital during the same period (0.9%, 212/22 765, P <0.01).
