While most people still think of cardiovascular trouble as primarily afflicting men, the reality is that heart disease has never...

While most people still think of cardiovascular trouble as primarily afflicting men, the reality is that heart disease has never discriminated between the sexes. In fact, for a variety of complex reasons, the condition is more often fatal in women than in men - it is also more likely to leave women severely disabled by a stroke or congestive heart failure. The common belief that pre-menopausal women are immune to heart problems is simply wrong. Which of the following, if true, would most strengthen the argument?