A number of factors like age, sex before marriage, education, earnings, literally everything was included in the study. Racial groups and gender combinations were superimposed on such data, and this is what proved to be the decisive risk factor with a very high confidence level. For negroid-white female pairs, the probability that this outcome is due to chance or factors other than race is less than 0.1%. The mere fact that a white woman married a black man doubles the risk of divorce, within four years of marriage. In practice, the risk of divorce between a black man and a white woman, relative to white people's relationships, is even higher than the aforementioned 85%. For example, in such relationships, usually the black man earns less than the woman, and this in itself increases the risk. The "85% higher risk" result ignores such cases, because the study was concerned with determining the risk associated solely with the interracial factor. The risk of divorce in interracial couples in all combinations, was close to the risk in the group with a higher risk for same-race marriages. In other words, the highest risk of divorce in same-race couples was in negroid couples, so any racial combination with a negroid partner took their worse value. Interestingly, marriages between white women and negroes trumped the statistics of negro marriages (a white man and a negro woman were below the negro-to-negro risk, but obviously above the white-to-white risk). In other words, no one gets along with negroes, not even other negroes. The worst couple is a white woman and a negroid, where, after excluding the influence of any other measurable factors, the risk of divorce is 85% higher than in white couples. When we take all negroid couples with a white woman and do not discount the results by factors like the guy earning less than the woman, divorces are several times more common than in white couples.