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Table 1 Preoperative demographic data

From: Comparison of percutaneous endoscopic thoracic decompression and posterior thoracic laminectomy for treating thoracic ossification of the ligamentum flavum: a retrospective study

Characteristics PETD group (n = 11) PTL group (n = 9) P value
Age (years) 61.9 ± 7.1 60.8 ± 7.2 0.73
Sex (male) 8 3 0.18
Duration of symptoms (months) 10.5 ± 8.4 8.1 ± 9.2 0.55
Body mass index (kg/m2) 23.8 ± 1.5 23.4 ± 1.3 0.62
Level    0.11
 T8–9 0 1  
 T9–10 2 0  
 T10–11 7 3  
 T11–12 2 5  
Sato classification    0.93
 Lateral type 3 3  
 Extended type 3 2  
 Enlarged type 4 2  
 Fused type 1 2  
 Tuberous type 0 0  
Dural adhesion 3 2  
Dural ossification 1 0  
  1. PETD percutaneous endoscopic thoracic decompression; PTL posterior thoracic laminectomy