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Table 2 Relation between PDI and clinical factors

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

PDI sign

     

Positive

78

52

17

5

4

Upper lobe

75

52

17

2

4

Lower lobe

3

0

0

3

0

Negative

60

12

4

21

23

Sex

     

Male

positive (upper)/ negative

66/52

46/12

17/4

2/24

1/12

Female

positive (upper)/ negative

9/11

6/0

0/0

0/0

3/11

Laterality

     

Right

positive (upper)/ negative

38/33

27/5

7/2

1/15

3/11

Left

positive (upper)/ negative

37/30

25/7

10/2

1/9

1/12

Asthma

     

Yes

positive (upper)/ negative

10/6

7/2

3/1

0/2

0/1

No

positive (upper)/ negative

65/57

45/10

14/3

2/22

4/22

  1. PDI: pulmonary delayed inflation