Application of the trend surface analysis for exploring the geographical distribution of the mortality of nasopha-ryngeal carcinoma
Jin Ron · Journal of Wenzhou Medical College · 2009
Objective:To apply trend-surface analysis for poviding clue on of mortality nasopha-ryngeal carcinoma.Methods:Trend-surface equation was established for mortality of nasopharyngeal carcinoma in male and female using data from the 1990-1992 mortality survey in the whole country,then proper regression equation for trend contour map and residual analysis.Results:The third-order equation was established for mortality of nasopharyngeal carcinoma in males with its fit goodness as 83.65% and in females with its fit goodness as 81.36%.There were positive residuals in Liaoning,Shanghai,Guangdong,Guangxi and Sichuan,while the negative residuals were in Heilongjiang,Fujian,Jiangxi,Hunan and Hainan for males.There were positive residuals in Liaoning,Shanghai,Guangdong,Guangxi and Sichuan,while the negative residuals were in Jiangsu,Anhui,Fujian,Hainan and Yunnan for females.Conclusion:The mortality of nasopharyngeal carcinoma among males and females is high in southeast and its inland areas which accord with the annual rainfall more than 800 mm areas.The relationship between nasopharyngeal carcinoma mortality with annual rainfall is worthy of further investigation.The mortality of nasopharyngeal carcinoma in other areas between males or females appears to be different.In those areas where the residual values are anomalous,further studies need to be carried out.