| Characteristics | Inpatients (n = 61) | Outpatients (n = 60) | p |
| Male (%) | 32 (52.5) | 38 (63.3) | 0.318 |
| Age (SD) | 57.3 (±14.2) | 56.9 (±13.8) | 0.855 |
| Left ventricular ejection fraction (SD) | 36.6% (±11.5) | 34.9% (±8.7) | 0.393 |
| Atrial fibrillation (%) | 24 (39.3) | 19 (31.6) | 0.309 |
| Hemoglobin (g/dL) | 12.6 (±2.1) | 13.4 (±2.3) | 0.402 |
| Creatinine (mg/dL) | 1.6 (±1.1) | 1.4 (±0.8) | 0.031 |
| Sodium (mEq/L) | 136 (±4.1) | 138 (±3.1) | 0.608 |
| White blood count (/mm3) | 8,889 (±4,620) | 8,577 (±3,085) | 0.006 |
| C-reactive protein (mg/L) | 36.5 (±55.4) | 6.5 (±9.9) | 0.0001 |
| NT pr-BNP (pg/mL) | 10,278 (±8,957) | 1,080 (±320) | 0.0001 |
| Respiratory tract infections | 19 (31.1) | 15 (25.0) | 0.418 |
| RT-PCR Influenza virus (%) | 6 (9.8) | 0 | 0.008 |
| Immunization against influenza virus (%) | 21 (34.4) | 33 (55.0) | 0.028 |
| Beta blockers (%)1 | 47 (77.0) | 58 (96.6) | 0.002 |
| ACE inhibitors/ARB (%)1 | 51 (81.3) | 57 (95.0) | 0.068 |
| Aldosterone receptor antagonist (%)1 | 33 (54.1) | 42 (70.0) | 0.090 |
| Hospital admissions (%) | - | 5 (8.3) | - |
| Deaths (%) | 8 (13.1) | 1 (1.6) | 0.016 |