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Table 2 Comparison between subjects with and without recurrence within 24 h (n = 122)

From: Clamping of chest drain before removal in spontaneous pneumothorax

  Early recurrence (within 24 h) P-value*
No Yes
(n = 106) (n = 16)
Age (year) 58.9 ± 22.7 61.4 ± 24.3 0.135
Male sex 98 (92.5) 14 (87.5) 0.619
Smokinga      1.000
 Never 18 (17.1) 2 (12.5)  
 Ex-smoker 59 (56.2) 10 (62.5)  
 Current smoker 28 (26.7) 4 (25)  
Charlson comorbidity index 1.8 ± 2.1 1.9 ± 1.9 0.581
Secondary pneumothorax 74 (69.8) 12 (75) 0.776
Side of pneumothorax      0.644
 Right 42 (39.6) 5 (31.3)  
 Left 63 (59.4) 11 (68.8)  
 Bilateral 1 (0.9) 0  
Size of pneumothoraxb 57.2 ± 25.2 50.3 ± 23.5 0.104
No. of previous episodes      0.023
 0 69 (65.1) 6 (37.5)  
 1 21 (19.8) 8 (50)  
 2 10 (9.4) 0  
  ≥ 3 6 (5.7) 2 (12.5)  
Total no. of chest tube(s)      0.270
 1 93 (87.7) 13 (81.3)  
 2 8 (7.5) 3 (18.8)  
  ≥ 3 5 (4.7) 0  
Prior medical pleurodesis 53 (50) 8 (50) 1.000
Type of chest tube      0.152
  ≥ fr 18 62 (58.5) 8 (50)  
 fr 12 44 (41.5) 7 (43.8)  
 fr 8 0 1 (6.3)  
Clinical setting      0.578
 Medical 101 (95.3) 15 (93.8)  
 Non-medical 5 (4.7) 1 (6.3)  
Duration of cessation of air leak before clamping/ removal (hour) 47.2 ± 34.4 33.2 ± 25.5 0.221
Duration of drainage (day) 10.3 ± 12.5 11.7 ± 19.2 0.596
  1. Data are presented as mean ± SD or count (%)
  2. * Mann-Whitney U test, Pearson’s chi-square test or Fisher’s exact test
  3. a n (no early recurrence) = 105
  4. b For non-loculated pneumothorax only: n (no early recurrence) = 45, n (early recurrence) = 4