Table 1 Clinical characteristics of the patients in the high SB and low SB groups.
Characteristic | High SB (n = 195) | Low SB (n = 207) | t** or χ2 value | p-Value |
|---|---|---|---|---|
Age (years)* | 78.3 ± 7.6 | 75.2 ± 6.7 | 4.36** | < 0.001 |
Sex, female (%) | 75 (38.5) | 67 (32.4) | 1.63 | 0.201 |
Body mass index (kg/m2)* | 21.9 ± 3.7 | 22.4 ± 3.5 | − 1.29** | 0.195 |
Employment (%) | 45 (23.1) | 105 (50.7) | 32.81 | < 0.001 |
Living together (%) | 163 (83.6) | 160 (77.3) | 2.52 | 0.112 |
Smoking (%) | 104 (53.3) | 91 (44.0) | 3.53 | 0.060 |
Marriage (%) | 131 (67.2) | 144 (69.6) | 0.26 | 0.607 |
Main diagnosis (%) | 46.87 | < 0.001 | ||
Heart failure | 107 (54.8) | 47 (22.7) | ||
Ischaemic heart disease | 75 (38.5) | 121 (58.4) | ||
Valvular disease | 5 (2.6) | 14 (6.8) | ||
Others | 8 (4.1) | 25 (12.1) | ||
Left ventricular ejection fraction (%)* | 51.9 ± 15.2 | 51.7 ± 12.7 | 0.14** | 0.88 |
Charlson Comorbidity Index* | 2.4 ± 2.8 | 2.3 ± 2.2 | 0.27** | 0.785 |
Haemoglobin (g/dL)* | 12.4 ± 2.3 | 12.4 ± 2.2 | − 0.19** | 0.85 |
Creatinine (mg/dL)* | 1.4 ± 1.7 | 1.3 ± 1.1 | 1.42** | 0.16 |
Blood urea nitrogen (mg/dL)* | 25.1 ± 13.6 | 23.3 ± 14.3 | 1.33** | 0.18 |
Medications (%) | ||||
Beta blocker (%) | 130 (66.7) | 143 (69.1) | 0.27 | 0.604 |
ACE-I and ARB (%) | 99 (50.8) | 111 (53.6) | 0.32 | 0.567 |
Diuretic (%) | 124 (63.6) | 116 (56.0) | 2.38 | 0.123 |
Statin (%) | 122 (62.6) | 121 (58.5) | 0.71 | 0.400 |
SB time (min/day)* | 718.42 ± 152.3 | 240.1 ± 118.7 | 35.22** | < 0.001 |
