Pertaining to the risk factors for ischemic heart disease (IHD), which of the following statements is correct?
1) Unstable angina is a greater risk factor for Myocardial Infarction than stable angina.
2) The elderly are at lower risk of myocardial infarction, partially due to reduced atherosclerosis progression.
3) Atherosclerosis in the right ventricle is a major risk factor.
4) Men are at increased risk of IHD due to increased lifetime oestrogen production.
5) Smoking, diabetes and hypertension are protective against the development of IHD.