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Table 2 Etiology and location of patients with CAO undergoing flexible bronchoscopy or rigid bronchoscopy

From: Safety application of muscle relaxants and the traditional low-frequency ventilation during the flexible or rigid bronchoscopy in patients with central airway obstruction: a retrospective observational study

  N (%) P value
Flexible (204) Rigid (171) Total (375)
Etiology of CAO
 Lung tumor 79 (38.7%) 57 (33.3%) 136 (36.3) 0.418
 Esophageal cancer 45 (22.1%) 42 (24.6%) 87 (23.2)  
 Tracheal tumor 39 (19.2%) 26 (15.2%) 65 (17.4%)  
 Scarring 25 (12.3%) 23 (13.5%) 48 (12.8%)  
 Post-placement of stenting 9 (4.4%) 13 (7.9%) 22 (5.6%)  
 Thyroid tumor 4 (2.0%) 4 (2.3%) 8 (2.1%)  
 Lymphoma 1 (0.5%) 3 (1.8%) 4 (1.1%)  
 Tuberculosis 2 (1.0%) 3 (1.8%) 5 (1.3%)  
Benign/Malignant
 Benign 72 (35.3%) 45 (26.3%) 117 (31.2%) 0.062
 Malignant 132 (74.7%) 126 (73.7%) 258 (68.8%)  
Location of CAO
 Tracheal 130 (63.7%) 120 (73.2%) 250 (66.7%) 0.187
 Left or right main bronchus 74 (36.3%) 51 (29.8%) 125 (33.3%)