Recent advances in safety systems have reduced injuries sustained in motor vehicle crashes. However, unlike other body regions, rib fractures remain a common and serious injury in these events. The goal of this study was to assess the ability of basic individual demographic information to predict thoracic vulnerability. A normative sample of 317 experimentally-tested mid-level human ribs formed the foundation of this study, and the resulting structural properties of percent displacement, peak force, and total energy allowed for rib vulnerability levels to be defined for each property. Thresholds for these levels may be useful for alterations and assessment of rib FE models and improvement of thoracic scaling techniques. Additional results suggest that age, sex, stature, and weight may be utilized with caution for predicting those ribs that are least and most vulnerable, but are not useful for distinguishing those in between. Individuals more likely to have vulnerable ribs include those that are older with smaller body size, particularly females, but this is not always the case. Further investigation is necessary in order to identify more appropriate predictors for occupant vulnerability.