Table 2.
Patient Characteristics Stratified by NT-proBNP Concentration
| Characteristic | NT-proBNP ≥551.35 ng/L (164) | NT-proBNP <551.35 ng/L (265) | P-value |
|---|---|---|---|
| Hospitalization mortality (%) | 17.07 | 0.38 | <0.001 |
| Hospital stay (days) | 9.68 | 8.07 | <0.001 |
| Age (yr.) | 79.18±8.47 | 74.38±9.39 | <0.001 |
| Male sex (%) | 65.85 | 66.79 | 0.841 |
| Body-mass index | 21.28±4.28 | 22.45±4.95 | 0.012 |
| Smoking status (%) | 0.250 | ||
| Never | 28.66 | 24.91 | |
| Former | 55.49 | 52.93 | |
| Current | 15.85 | 22.26 | |
| Smoking history (pack-yr.) | 44.02±30.88 | 47.86±31.14 | 0.288 |
| COPD stage (%) | 0.016 | ||
| I | 5.49 | 11.32 | |
| II | 46.34 | 32.83 | |
| III | 35.37 | 38.49 | |
| IV | 12.80 | 17.36 | |
| Congestive heart failure (%) | 50.00 | 27.17 | <0.001 |
| Renal dysfunction (%) | 76.22 | 63.77 | 0.007 |
| Exacerbations during preceding year (%) | 51.83 | 43.77 | 0.104 |
| Number of exacerbations during preceding year | 1.05 | 1.00 | 0.697 |
| Neutrophil count (×109/L) | 8.75±5.34 | 7.36±3.75 | 0.004 |
| Hemoglobin (g/L) | 125.21±24.22 | 132.98±16.49 | <0.001 |
| D-dimer (μg/L) | 791.25±1241.76 | 384.90±688.54 | <0.001 |
| pH | 7.39±0.07 | 7.39±0.05 | 0.547 |
| PaO2(mmHg) | 85.27±31.83 | 89.60±24.36 | 0.121 |
| PaCO2(mmHg) | 46.90±16.37 | 44.61±10.22 | 0.197 |
| Creatinine (μmmol/L) | 108.30±64.14 | 86.62±42.37 | 0.115 |
| BUN (mmol/L) | 8.63±5.74 | 5.57±2.42 | <0.001 |
Note: Plus–minus values are means ±standard deviation.
Abbreviations: COPD, Chronic obstructive pulmonary disease; BUN, blood urea nitrogen; PaO2, partial pressure of O2; PaCO2, partial pressure of CO2.