Table 4. Propensity-matched comparison in patients with PSP.
| Characteristics at operation | Patients with PPSH (N=45) | Patients without PPSH (N=45) | P value |
|---|---|---|---|
| Age (years), median [IQR] | 19 (16.5–21) | 19 (16.5–21) | 1.000† |
| Sex, n (%) | 1.000‡ | ||
| Male | 43 (95.6) | 43 (95.6) | |
| Female | 2 (4.4) | 2 (4.4) | |
| Height (cm), median (IQR) | 174.0 (169.5–177.5) | 173.0 (168.5–178) | 0.875† |
| Body weight (kg), median (IQR) | 56.0 (51.5–61.0) | 55.0 (50.5–61.5) | 0.884† |
| BMI (kg/m2), median (IQR) | 19.1 (17.3–20.3) | 18.9 (17.3–20.7) | 0.821† |
| Thoracic APDT/TDT ratio, median (IQR) | 0.517 (0.480–0.554) | 0.487 (0.463–0.529) | 0.031† |
| Mediastinal APDT/TDT ratio, median (IQR) | 0.306 (0.262–0.333) | 0.270 (0.228–0.309) | 0.008† |
†, continuous variables were compared using the Mann-Whitney U-test; ‡, frequencies were compared using Fisher’s exact test for categorical variables. PSP, primary spontaneous pneumothorax; PPSH, parietal pleural small hole; IQR, interquartile range; BMI, body mass index; APDT, anteroposterior diameter; TDT, transverse diameter.