Table 3. Parameters of body composition following BIA for the studied patients.
| Parameter | Patients with atrial fibrillation (n = 120) | Control group (n = 240) | p value |
| FM (%) | 35.7 ± 9.6 | 30.7 ± 9.5 | < 0.001 |
| Patients with obesity: defined as FM > 25% for males and > 35% for females (n, %) | 66 (55.4) | 102 (42.5) | 0.025 |
| Level of visceral adipose tissue (score, 1-59) | 15.2 ± 4.7 | 12.5 ± 4.1 | < 0.001 |
| Patients with excess of visceral adiposity (> 26 score) (n, %) | 72 (71.3) | 94 (39.2) | < 0.001 |
| Fat-free mass (kg) | 55.4 ± 12.1 | 52.4 ± 11.6 | 0.035 |
| TBW (kg) | 41.6 ± 25.1 | 36.6 ± 8.3 | 0.010 |
| Predicted muscle mass (kg) | 52.7 ± 11.5 | 49.9 ± 10.9 | 0.038 |
| Percentage of skeletal muscle mass (%) | 36.4 ± 5.4 | 39.2 ± 5.4 | < 0.001 |
| Patients with moderate sarcopenia in relation to established cut-off values given in abbreviations (n, %) | 39 (32.5) | 69 (28.8) | 0.47 |
| Patients with moderate sarcopenia in relation to established cut-off values for SMI (n, %) | 34 (28.3) | 37 (15.4) | 0.037 |
| Bone mass (kg) | 2.8 ± 0.6 | 2.8 ± 2.8 | 0.825 |
| Metabolic age (years) | 71.1 ± 11.7 | 64.1 ± 12.2 | < 0.001 |
| Difference between metric and metabolic age (years) | 0.9 ± 12.8 | -5.7 ± 11.3 | < 0.001 |
| Patients with metabolic age greater than the metric age (n, %) | 53 (52.4) | 63 (26.3) | < 0.001 |
| Basal metabolic rate (kcal) | 1659.4 ± 353.0 | 1543.9 ± 323.9 | 0.004 |
BIA, bioelectrical impedance analysis; FM, fat mass; SMI, skeletal muscle index; TBW, total body water.
Established cut-off values for % of skeletal muscle mass were: < 37% for men (relevant to class I sarcopenia for men) and < 27.6% for women; established cut-off values for SMI were: ≤ 10.76 kg/m2 for men and ≤ 6.76 kg/m2 for women.