Research Of Linear Correlation Regression Analysis Between Esophageal Length And Length Of Mark In The Body

It is important to measure esophageal length in esophageal surgery,for instance,placement of stomach-tube,orientation of esophageal disease,selecting of esophageal operative incision and electing of esophageal reconstruct.The length of esophagus varies with individuals difference. Precently, there are some methods for measurement of the esophageal length.But,different methods and instruments cause diversities.So the measurement of the esophageal length only reflects nomal ranges of the esophageal length,it dose not reflect the correlation between esophageal and mark in the body.Our aim was to determine whether the length of esophagus was correlated with age,sex,weight,and height and to find out a mark in the body surface which could indicate the esophageal length well.In this study we measured the length of esophagus in 214 health adults (115 males and 99 females ,vary rang from 18-73 year) with a XQ-40 type fiberogastroscope, and recorded their age,sex,height, weight and length of the sternum. Then we analyzed their correlation with these date on acomputer.The results measured showed:(1)the mean esophageal length was 26.36±1.70 cm (rang 22.00~29.90 cm); (2)the mean height was 162.53±7.73cm (143.00cm-179.00cm); (3)the mean length of the sternum was 19.62±1.68cm (25.30～16.00).Linear regression analysis demonstrated (1)a significant correlation between the length of the esophagus and height; (2) a significant correlation between the esophageal length and the length of the sternum;(3)the esophageal length has not correlated with age, sex and weight.From Linear regression we drawed three formulas,which could forcast the esophageal length with height and the length of the sternum:Esophageal length(cm)＝0.203×Height(cm)－6.590cm. formula 1Esophageal Iength(cm)＝0.860×length of sternum(cm)+9.486cm. formula 2Esophageal Length(cm)＝0.168×High(cm)+0.185×Length of Sternum(cm)－4.506cm. formula 3In order to check up the veracity of the three formulas, we measured the height and the length of the esophagus and the sternum in 30 health adults,then calculated the length of the esophagus according to the three formulas respectively. Finally,we compared the calculated esophageal length and the measured length and found that all the three formulas could forcast the esophageal length exactly.There was no distinct difference in the three formulas,and the difference between the calculated esophageal length and the measured length was the least in formula 3 .We think that the formula 3 can most exactly forcast the esophageal length in most adults.But in some rare cases (disproportion between limb and trunk ), formula 2 is more appropriate for forcasting the esophageal length. Our conclusion is that the three formulas are helpful in forcasting the esophageal length, accurating localization of the esophageal lesion and in other esophageal surgeries.