Table 2. Univariate analysis of patients with aspiration failure.
| Variables | Success, n=81 | Failure, n=26 | P value |
|---|---|---|---|
| Age (median, IQR) (%) | 28.0 (33.5–66.0) | 56.5 (17.0–56.5) | 0.012 |
| Sex (male, %) | 67 (82.7) | 24 (92.3) | 0.35 |
| Smoking history | 30 (37.0) | 16 (61.5) | 0.039 |
| Type of pneumothorax (%) | |||
| Spontaneous primary | 54 (66.7) | 14 (53.9) | 0.25 |
| Spontaneous secondary | 19 (23.5) | 12 (46.2) | 0.045 |
| Traumatic | 5 (100.0) | 0 (0) | 0.33 |
| Iatrogenic | 3 (100.0) | 0 (0) | 0.43 |
| Side of pneumothorax (left, %) | 45 (55.6) | 14 (53.9) | 0.65 |
| ≤24 h from onset to presentation (%) | 32 (39.5) | 16 (61.5) | 0.041 |
| Chest X-ray findings | |||
| Apex to cupola distance (median, IQR) (mm) | 58 (36.5–83.0) | 67 (20.3–106.0) | 0.72 |
| Inter pleural distance at level of the hilum >20 mm | 49 (60.5) | 23 (88.5) | 0.0082 |
| Midline shift distance at level of the carina ≥10 mm | 13 (16.1) | 15 (57.7) | <0.001 |
| Pneumothorax size using the Light index (median, IQR) (%) | 43.1 (29.3–61.3) | 74.0 (50.6–86.5) | <0.001 |
| Severe collapsed lung using the JSPCLD classification criteria (%) | 28 (34.6) | 18 (69.2) | 0.0028 |
| Intrathoracic pressure (median, IQR) (cmH2O) | |||
| Before aspiration | −0.2 (−1.6 to +2.1) | 2.7 (1.4 to 4.8) | 0.0051 |
| After aspiration | −6.0 (−6.6 to 4.3) | −6.7 (−8.8 to 2.4) | 0.73 |
| Plasma factor XIII (median, IQR) (%) | 78.0 (70.5 to 108.5) | 87.0 (74.8 to 116.5) | 0.65 |
Categorical variables are presented as n (%). Continuous variables are presented as indicated. IQR, interquartile range; JSPCLD, The Japan Society for Pneumothorax and Cystic Lung Diseases.