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Table 4 Inflation time in the upper lobes

From: A novel finding related to bulla and bleb formation in patients with primary spontaneous pneumothorax

PDI sign

Total

 ≤ 34 years of age, nonsmokers

 ≤ 34 years of age, smokers

 ≥ 55 years of age

Control group

Number

138

64

21

26

27

Inflation time, mean, seconds

 ± SD

30.8 ± 48.7

42.3 ± 47.8

55.6 ± 62.5

1.9 ± 6.7

12.2 ± 43.3

  1. PDI: pulmonary delayed inflation
  2. SD: standard deviation
  3. The inflation time in nonsmoking patients 34 years of age or younger was significantly longer than that in patients 55 years of age or older (p < 0.0001) and that noted in the control group (p = 0.0059). There was no significant difference between smoking and nonsmoking patients 34 years of age or younger (p = 0.3109)
  4. The inflation time in smokers 34 years of age or younger was significantly longer than that noted in patients 55 years of age or older (p < 0.0001), and patients in the control group (p = 0.0067)