非对角元素 meaning in English

off-diagonal elements

Have been suggested . given a contingency table whose cells are numbers of parents who either do or not transmit the associated marker alleles to affected children , t compares every symmetric pairs , both tn and t compare row and column total for every marker allele . tm uses all cells but t uses non - diagonal elements only
给定一个列联表(其元素为传递或未传递某种等位基因给生病小孩的父母的个数) ， tc比较列联表的每一个对称的部分， tm和tmhet均比较其相应的行和与列和，但tm用到了表中所有的元素，而tmhet只用了非对角元素。