Table 4 Outcomes by number of rib fractures as category according to the optimal cut-off

Any intra-thoracic and intra-abdominal injuries

104 (51.0%)

175 (88.8%)

 < 0.001

Significant intra-thoracic and intra-abdominal injuries

52 (25.5%)

130 (66.0%)

 < 0.001

Chest and upper abdominal trauma only

Number of rib fractures < 3 (N = 180)

Number of rib fractures ≥ 3 (N = 124)

P-value

Any intra-thoracic and intra-abdominal injuries

90 (50.0%)

106 (85.5%)

 < 0.001

Significant intra-thoracic and intra-abdominal injuries

45 (25.0%)

76 (61.3%)

 < 0.001