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Table 1 Characteristics of the overall population

From: Procalcitonin and C-reactive protein perform better than the neutrophil/lymphocyte count ratio in evaluating hospital acquired pneumonia

 Non-infection n = 254HAP n = 339
Age (years)66.6 ± 17.171.0 ± 17.9 **
Sex (M / F)152 / 102252 / 87 *
WBC abnormalities, n, (%)54 (21.3%)130 (38.2%) *
NE abnormalities, n, (%)183 (72.0%)254 (74.7%) *
APACHE II score (mean ± sd)17.7 ± 5.921.7 ± 6.1 ***
NLCR10.2 ± 9.813.0 ± 17.1 *
PCT (ng/ml)0.75 ± 3.254.60 ± 15.97 ***
CRP (mg/ml)45.8 ± 50.673.3 ± 79.6 ***
Blood lactate (mmol/l)1.6 ± 1.31.5 ± 0.8
Surgery, n, (%)100 (39.4%)87 (25.6%) **
28 days survival, n, (%)205 (80.7%)233 (68.5%) **
Diabetes mellitus, n, (%)5 (2.0%)0 (0) *
Cardiovascular disease, n, (%)28 (11.0%)18 (5.3%) *
Hypertension, n, (%)5 (2.0%)1 (0.3%) *
Malignancies, n, (%)54 (21.3%)10 (2.9%) ***
COPD, n, (%)10 (3.9%)17 (5.0%)
Liver cirrhosis, n, (%)2 (0.8%)0 (0)
Renal failure, n, (%)2 (0.8%)16 (4.7%) **
  1. Data were expressed as Mean ± standard deviation or number (percentage) of current group. *p < 0.05, **p < 0.01, ***p < 0.001 vs non-infection group. WBC white blood count; NE neutrophil; NLCR neutrophil/lymphocyte count ratio; PCT procalcitonin; CRP C-reactive protein; HAP hospital acquired pneumonia; COPD chronic obstructive pulmonary disease