Boys are 28 percent more likely than girls to have a stroke, and black children are more than twice as likely to have a stroke as other ethnic groups, according to a new study. Researchers identified 2,278 first admissions for childhood stroke in a 10-year period in California by examining a statewide hospital discharge database. Children were one month through 19 years of age and were classified by their parent or guardian as white, black, Hispanic, Asian or other. Boys made up 51 percent of the population, and girls made up 49 percent.