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Table 1 Demographic characteristics of the study subjects

From: Diagnosis of ventilator-associated pneumonia using electronic nose sensor array signals: solutions to improve the application of machine learning in respiratory research

Characteristics Case group (n = 33) Control group (n = 26) p value
Age (year), mean (SD) 71.44 (13.43) 68.90 (15.55) 0.53
Male, No. (%) 21 (63.64) 13 (50.00) 0.12
Smoking status    0.18
 Current smoker, No. (%) 4 (12.12) 4 (15.38)  
 Former smoker, No. (%) 12 (36.36) 4 (15.38)  
 Nonsmoker, No. (%) 15 (45.45) 12 (46.15)  
White blood cell (103/μL), mean (SD) 14.63 (7.87) 15.03 (8.77) 0.86
Blood urea nitrogen (mg/dL), mean (SD) 30.65 (18.74) 32.54 (18.43) 0.72
Creatinine (mg/dL), mean (SD) 1.24 (0.71) 1.58 (1.01) 0.15
Aspartate aminotransferase (U/L), mean (SD) 88.48 (139.48) 53.71 (139.48) 0.25
Alanine aminotransferase (U/L), mean (SD) 55.80 (82.11) 35.62 (25.82) 0.22
Number of comorbidities 3.16 (1.10) 2.90 (1.18) 0.43