Some parents have been worried about giving their children pain relievers like ibuprofen and acetaminophen, based on reports that children who take the drugs are more likely to develop asthma. But a new study suggests that the relationship may be little more than a statistical oversight. Augusto Litonjua, HMS assistant professor of medicine, and Joanne Sordillo, HMS instructor in medicine, both of Brigham and Women’s Hospital, led the study.