Table 1.
Patient characteristics and body composition measures by age group
| ALL | <50 | 50-64 | ≥65 | |
|---|---|---|---|---|
| N | 241 | 105 | 106 | 30 |
| Age at Diagnosis (years) | ||||
| Mean (range) | 52 (23-87) | 42 (23-50) | 57 (50-64) | 71 (65-88) |
| Body Mass Index (BMI) | ||||
| Mean (range) | 29 (17-73) | 28 (17-45) | 29 (19-73) | 28 (20-42) |
| % Obese | 38 | 36 | 42 | 33 |
| Stage at Diagnosis | ||||
| 2 | 144 (60%) | 61 (58 %) | 66 (62%) | 17 (57%) |
| 3 | 97 (40%) | 44 (42%) | 40 (38%) | 13 (43%) |
| Tumor Classification | ||||
| HR+/Her2− | 139 (58%) | 59 (56%) | 59 (55%) | 21 (70%) |
| Her2+ | 49 (20%) | 24 (23%) | 22 (21%) | 3 (10%) |
| Triple Negative | 53 (22%) | 22 (21%) | 25 (24%) | 6 (20%) |
| Race | ||||
| White | 168 (70%) | 73 (70%) | 72 (68%) | 23 (77%) |
| Black | 65 (27%) | 25 (24%) | 34 (32%) | 6 (20%) |
| Other | 8 (3%) | 7 (7%) | 0 (0%) | 1 (3%) |
| Body Composition Measures (Means with 95% confidence intervals, or percentages) | ||||
| Muscle Area (cm2) | 119 [116, 121] | 122 [119, 126] | 119 [115, 122] | 104 [97.7, 111] |
| Skeletal Muscle Index (cm2/m2) | 44.5 [43.5, 45.4] | 45.9 [44.5,47.3] | 44.3 [42.8, 45.8] | 40.2 [37.7, 42.6] |
| Skeletal Muscle Density (HU) | 35.6 [34.5, 36.8] | 40.0 [38.5, 41.4] | 33.1 [31.4, 34.7] | 29.7 [26.7, 32.7] |
| Skeletal Muscle Gauge (AU) | 1576 [1519, 1632] | 1818 [1744, 1891] | 1447 [1370, 1524] | 1184 [1061, 1308] |
| VAT (cm2) | 90.8 [81.6. 100] | 68.8 [57.5, 80.1] | 104 [88.9, 120] | 120 [95.3, 145] |
| SAT (cm2) | 267 [248, 286] | 263 [237, 290] | 279 [248, 310] | 238 [189, 286] |
| % Sarcopenic | 34 | 28 | 32 | 63 |
| % Myosteatic | 34 | 44 | 81 | 90 |
| % Sarcopenic & Myosteatic | 22 | 8 | 26 | 57 |
Abbreviations: HR, Hormone Receptor. HU, Hounsfield units; SAT, subcutaneous adipose tissue area. VAT, visceral adipose tissue area.