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Table 4 Comparison among different severity levels of asymptomatic PSP

From: The incidence and risk factors of asymptomatic primary spontaneous pneumothorax detected during health check-ups

   Total Mild Moderate Severe   
    n = 22 (%) n = 12 (%) n = 9 (%) p-value  
Right or left
  right 23 9 (40.9%) 9 (75.0%) 5 (55.6%) 0.161  
  left 20 13 (59.1%) 3 (25.0%) 4 (44.4%)   
Pleural effusion
  (−) 30 20 (90.9%) 9 (75.0%) 1 (11.1%) <0.001 ***
  (+) 13 2 (9.1%) 3 (25.0%) 8 (88.9%)   
Previous pneumothorax
  (−) 32 15 (68.2%) 9 (75.0%) 8 (88.9%) 0.486  
  (+) 11 7 (31.8%) 3 (25.0%) 1 (11.1%)   
Recalled symptom
  (−) 38 20 (90.9%) 10 (83.3%) 8 (88.9%) 0.804  
  (+) 5 2 (9.1%) 2 (16.7%) 1 (11.1%)   
Therapy
  conservative 18 11 (50.0%) 5 (41.7%) 2 (22.2%) 0.452  
  invasive 18 8 (36.4%) 4 (33.3%) 6 (66.7%)   
  N/A 7 3 (13.6%) 3 (25.0%) 1 (11.1%)   
  1. ***: p < 0.001