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| Clinical features | Number of cases | t/χ2 | P | |
|---|---|---|---|---|
| Surgery | Conservative | |||
| Age (years) | ||||
| ≥60 | 21 (19.1%) | 25 (22.7%) | ||
| <60 | 38 (34.6%) | 26 (23.6%) | 2.027 | 0.155 |
| Sex | ||||
| Male | 34 (30.9%) | 28 (25.5%) | ||
| Female | 25 (22.7%) | 23 (20.9%) | 0.083 | 0.774 |
| Numbers of flail chest | 49 | 19 | 24.306 | 0.000 |
| Numbers of ICU treatment | 56 | 46 | 0.903 | 0.342 |
| Numbers of thoracic drainage | 45 | 31 | 3.072 | 0.080 |
| Number of fractured ribs | 6.42±2.11 | 6.13±1.98 | 0.730 | 0.467 |
