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Table 2 Changes in the pulmonary function and Haller index after the bar insertion

From: Pulmonary function before and after the Nuss procedure in adolescents with pectus excavatum: correlation with morphological subtypes

  Symmetric type (n = 9) Asymmetric type (n = 9) p
Preoperative PF    
Restrictive, n (%)a 0 (0) 1 (5.6) 1
Obstructive, n (%)b 0 (0) 0 (0) 1
Postoperative PF    
Restrictive, n (%) 1 (5.6) 4 (22.2) 0.294
Obstructive, n (%) 0 (0) 0 (0) 1
Preoperative HIc 3.8 ± 0.8 3.8 ± 1 0.971
Postoperative HI 2.7 ± 0.4 2.8 ± 0.2 0.387
  1. HI = Haller index; PF = pulmonary function.
  2. aThe restrictive pattern is forced volume capacity (FVC) and forced expiratory volume in 1 second (FEV1) values of less than 80% predicted and an FEV1/FVC ratio greater than 80%.
  3. bThe obstructive pattern is a FEV1/FVC ratio of less than 67%.
  4. cThe Haller index is calculated as the inner transverse thoracic diameter divided by the anteroposterior distance between the anterior thoracic wall and the spine at the narrowest point.