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Table1 Characteristics of the enrolled patients

From: Efficacy prediction of noninvasive ventilation failure based on the stacking ensemble algorithm and autoencoder

Item Value or number
Age, years 69 ± 14
Male N = 1794
APACHE II 16 ± 5
NIV failure N = 740
Diagnosis  
 AECOPD N = 1122
 Pneumonia N = 652
 ARDS N = 197
Sleep apnoea-hypopnea syndrome N = 65
 Asthma N = 70
 Heart failure N = 50
 Bronchiectasis N = 46
 Sepsis N = 44
 Pulmonary embolism N = 39
 Pulmonary tuberculosis associated sequelae N = 35
 Chest wall deformity N = 22
Obesity-hypoventilation syndrome N = 6
Chronic thoracic sequelae N = 2
 Others N = 145
Underlying disease  
 Hypertension N = 889
 Diabetes mellitus N = 493
 Chronic liver disease N = 53
 Chronic kidney disease N = 104
 Chronic heart disease N = 201
 Chronic lung disease N = 1459
 Immunosuppression N = 100
 Solid tumour N = 238
Variables collected before NIV  
 GCS 14.6 ± 1.2
Systolic blood pressure, mmHg 137 ± 26
Diastolic blood pressure, mmHg 81 ± 16
 Heart rate, beats/min 134 ± 23
Respiratory rate, breaths/min 31 ± 7
 pH 7.36 ± 0.11
 FiO2 0.42 ± 0.15
 PaCO2, mmHg 57 ± 26
 PaO2, mmHg 72 ± 39
 PaO2/FiO2 178 ± 87
Variables collected after 1 h of NIV  
 Tidal volume, mL 413 ± 160
 Minute ventilation, L 11.2 ± 6.6
Inspiratory pressure, cmH2O 15 ± 4
Expiratory positive airway pressure, cmH2O 6 ± 2
 GCS 14.6 ± 1.2
Systolic blood pressure, mmHg 127 ± 23
Diastolic blood pressure, mmHg 74 ± 14
 Heart rate, beats/min 104 ± 23
Respiratory rate, breaths/min 27 ± 7
 pH 7.39 ± 0.09
 FiO2 0.50 ± 0.16
 PaCO2, mmHg 54 ± 22
 PaO2, mmHg 95 ± 40
 PaO2/FiO2 205 ± 89