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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

CharacteristicsCase 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 comorbidities3.16 (1.10)2.90 (1.18)0.43