For comparison, genetically similar O'odham in Mexico have only a slighter higher prevalence of type 2 diabetes than non-O'odham Mexicans. The Akimel O'odham associate great importance to the names of individuals. From age ten until the time of marriage, neither boys nor girls were allowed to speak their own names out loud. The Pima Indians believed such an act would bring bad luck to the children and their future. Similarly, people in the tribe do not say aloud the names of deceased people, in order to avoid bad luck by calling their spirits back among the living. But the word or words in the name are not dropped from the language. The people gave their children careful oral instruction in moral, religious and other matters. Their ceremonies often included set speeches, in which the speaker would recite portions of their cosmic myth. Such a recounting was especially important in the preparation for war. These speeches were adapted for each occasion but the general context was the same.