“ Researchers have discovered that children and teenagers with high hostility levels are up to three times more likely to develop metabolic syndrome ​ — a dangerous precursor to heart disease — ​ than their more mellow peers, ” reports The Gazette of Montreal.
فقد قام باحثون اميركيون وفنلنديون بقياس مستوى العدائية عند ١٣٤ مراهقا وولدا .‏