[Evaluation of the effect of causes of death of advanced schistosomiasis patients on the life span of population by using potential years of life lost analysis].
OBJECTIVE
To evaluate the effect of the causes of death of advanced schistosomiasis patients on the life span of population in an area where schistosomiasis had been under control by applying the indicators of potential years of life lost (PYLL) and rate of PYLL (PYLLR).


METHODS
Using the formula of calculation of PYLL and PYLLR, the causes of death of 487 patients of advanced schistosomiasis in 3 previously endemic townships of Shanghai suburb.


RESULTS
Of 487 cases who died between 1955 and 1995, the PYLLR of all causes of death was 256.3@1000. The main causes of death were hepatic failure (100.3@1000), liver carcinoma (43.4@1000) and cancer of other organs (24.8@1000). In the 1960s, the PYLLR of advanced schistosomiasis complicated with hepatic failure and upper digestive tract hemorrhage was 222.2@1000 and 34.5@1000, the PYLLR of the complications of schistosomal liver cirrhosis, hepatic failure and hemorrhage accounted for 67.5% of the total PYLLR, being apparently higher in the non-splenectomy group than in the splenctomty group. After the schistosomiasis was under control, both PYLL and PYLLR decreased linearly. As compared with the 1960s, the PYLLR of all causes of death and the causes of death of the complications of schistosomal liver cirrhosis in the 1990s has declined by 62.9% and 83.2%, respectively, the PYLLR of upper digestive tract hemorrhage was found only 0.3@1000 in the last 5 years.


CONCLUSIONS
PYLL and PYLLR analysis could be used to quantify the effect of complications of advanced schistosomiasis and other causes of death on the life span of population.
Huang
D
D
Shanghai Municipal Institute of Parasitic Disease Control and Research, Shanghai 200336.
Ma
X
X
Cai
L
L
D000293:Adolescent; D000328:Adult; D000368:Aged; D002423:Cause of Death; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D008017:Life Expectancy; D017093:Liver Failure / Q000150:complications; D008113:Liver Neoplasms / Q000150:complications; D008297:Male; D008875:Middle Aged; D012554:Schistosomiasis japonica / Q000150:complications / Q000401:mortality*