"Sex Differences in the Effectiveness of Early Coronary Computed Tomographic Angiography Compared With Standard Emergency Department Evaluation for Acute Chest Pain"   
Circ May/Jun 2013
http://circ.ahajournals.org/content/127/25/2494.abstract
"Conclusions—This trial provides data supporting an early CCTA strategy as an attractive option in women presenting to the ED with symptoms suggestive of acute coronary syndrome. The findings may be explained by lower CAD prevalence and severity in women than men."