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Table 1 Characteristics and risk factors for spontaneous pneumothorax (SP) in patients according to seasons*

From: Spontaneous pneumothorax and ozone levels: is there a relation?C’è un rapporto tra pneumotorace spontaneo e livelli di ozono?

Characteristics Spring (n = 25) Summer (n = 12) Autumn (n = 12) Winter (n = 9) P
Male/Female 21/4 11/1 11/1 8/1 0.87
Age (years) 40 ± 20 31 ± 15 30 ± 18 34 ± 18 0.43
Smoking History +/- 18/7 10/2 7/5 7/2 0.56
Severity of SP      
   Moderate 13 3 5 6  
   Severe 4 4 3 0 0.28
   Undefined** 8 5 4 3  
  1. *Data are presented as mean ± SD or absolute numbers.
  2. **SP patients who did not have chest X-rays because of emergency conditions.