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Table 1 Baseline characteristics of patients who failed spontaneous breathing trial

From: Noninvasive mechanical ventilation may be useful in treating patients who fail weaning from invasive mechanical ventilation: a randomized clinical trial

  NPPV (n = 28) IMV (n = 37) P value
Age, years 67.6 ± 15.5 59.7 ± 17.6 0.06
Gender, male/female 15/13 23/14 0.61
APACHE II score at admission 20 ± 6.8 18.0 ± 5.9 0.27
Duration of mechanical ventilation, days 7.3 ± 4.1 7.3 ± 4.1 0.98
Causes of mechanical ventilation, number (percentage)    
   COPD aggravation and asthma 10 (35.6%) 13 (35.1%)  
   Heart diseases 7 (25%) 4 (11%)  
   Respiratory diseases 1 (3.6%) 2 (5.4%)  
   Post-surgery respiratory failure 5 (18%) 11 (29.8%)  
   Acute pulmonary lesion 0 (0%) 2 (5.4%)  
   Pneumonia 3 (11%) 1 (2.7%)  
   Tuberculosis 1 (3.6%) 2 (5.4%)  
   Thoracic trauma 1 (3.6%) 1 (2.7%)  
  1. Values are mean ± standard deviation or number (percentage). P value indicates comparison between treatment groups using t test or chi-square test. APACHE II, Acute Physiologic And Chronic Health Evaluation II; COPD, chronic obstructive pulmonary disease; IMV, invasive mechanical ventilation; NPPV, noninvasive mechanical ventilation.