Table 3.
Clinical features and risks associated with EFBs based on the number of pressure points.
| Parameter | 2 pressure points (225 cases) | ≥3 pressure points (184 cases) | t or χ2 | P |
|---|---|---|---|---|
| Gender (male/female) | (79/146) | (100/84) | 15.220 | <0.001*** |
| Age (y) | 55.88 ± 15.66 | 47.72 ± 18.96 | −4.681 | <0.001*** |
| DOI (h) | 31.33 ± 49.76 | 22.38 ± 37.12 | −2.083 | 0.038* |
| DFI (cm) | 19.78 ± 4.91 | 20.98 ± 4.60 | 2.538 | 0.012* |
| LOS (day) | 2.69 ± 2.98 | 2.40 ± 3.84 | −0.850 | 0.396 |
| Lmax (cm) | 20.99 ± 8.18 | 23.07 ± 9.82 | 2.329 | 0.020* |
| Lmin (cm) | 4.45 ± 2.38 | 14.32 ± 6.45 | 19.693 | <0.001*** |
| Lmax/Lmin | 5.73 ± 3.18 | 1.96 ± 1.49 | −15.818 | <0.001*** |
| Managements | 7.141 | 0.068 | ||
| FE (%) | 135 (60.00%) | 121 (65.76%) | ||
| RE (%) | 79 (35.11%) | 62 (33.70%) | ||
| Surgery (%) | 10 (4.44%) | 1 (0.54%) | ||
| Bronchoscopy (%) | 1 (0.44%) | 0 (0.00%) | ||
| Complications | ||||
| Perforation (%) | 61 (27.11%) | 25 (13.59%) | 11.149 | 0.001** |
| Severe complication (%) | 28 (12.44%) | 10 (5.43%) | 5.901 | 0.015* |
A group of 2 pressure points contains sharp EFBs of pin-like and spindle shapes; a group of ≥3 pressure points contains sharp EFBs of sheet, trident, and irregular shapes. Blunt EFBs were not included in this table. DOI: duration of impaction; DFI: distance from incisor; LOS: length of stay; Lmax: length of major axis; Lmin: length of minor axis. *P < 0.05; **P < 0.01; ***P < 0.001.