Relationships between seismic intensity and the prevalence of types of chest injury in patients admitted to our hospital after the Wenchuan and Lushan earthquakes.

aSome patients suffered from more than one type of chest injury and therefore appear multiple times in this table. One patient with diaphragmatic hernia, one with thoracic duct injury, two with mediastinal emphysema and one with mediatinal effusion were not included in the analysis.*Based on the likelihood ratio chi-squared test.