Table 1.
Characteristics of B-SCANS study population stratified by quartiles of subcutaneous fat and visceral fat.
| Quartiles of Subcutaneous Adipose Tissue (cm2) | Quartiles of Visceral Adipose Tissue (cm2) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Category boundaries | [19, 160] | (160, 238] | (238, 336] | (336, 891] | [0.484, 43.2] | (43.2, 94.6] | (94.6, 163] | (163, 454] | Total |
| N | 854 | 897 | 790 | 694 | 952 | 845 | 808 | 630 | 3,235 |
| Deaths | 177 | 177 | 177 | 177 | 177 | 177 | 177 | 177 | 708 |
| Age [mean (sd)] | 52.20 (12.95) | 54.42 (11.98) | 54.72 (10.82) | 55.29 (10.86) | 48.63 (11.62) | 53.37 (11.28) | 56.62 (10.74) | 60.09 (10.15) | 54.1 (11.8) |
| Race | |||||||||
| White/non-Hispanic | 627 (74.2) | 615 (69.3) | 559 (71.7) | 476 (69.3) | 696 (74.0) | 573 (68.3) | 518 (65.2) | 490 (78.4) | 2,277 (71.2) |
| Black | 30 ( 3.6) | 50 ( 5.6) | 50 ( 6.4) | 100 (14.6) | 57 ( 6.1) | 70 ( 8.3) | 72 ( 9.1) | 31 ( 5.0) | 230 ( 7.2) |
| Hispanic | 36 ( 4.3) | 68 ( 7.7) | 96 (12.3) | 80 (11.6) | 49 ( 5.2) | 70 ( 8.3) | 93 (11.7) | 68 (10.9) | 280 ( 8.8) |
| Asian/Pacific Islander | 152 (18.0) | 154 (17.4) | 75 ( 9.6) | 31 ( 4.5) | 139 (14.8) | 126 (15.0) | 111 (14.0) | 36 ( 5.8) | 412 (12.9) |
| Other | 9 | 10 | 10 | 7 | 11 | 6 | 14 | 5 | 36 |
| Smoking Status | |||||||||
| Never | 527 (63.0) | 566 (64.2) | 433 (55.9) | 388 (57.2) | 589 (63.4) | 520 (63.0) | 487 (61.4) | 318 (51.0) | 1,914 (60.4) |
| Former | 235 (28.1) | 242 (27.5) | 253 (32.6) | 229 (33.8) | 253 (27.2) | 230 (27.9) | 230 (29.0) | 246 (39.5) | 959 (30.3) |
| Current | 74 ( 8.9) | 73 ( 8.3) | 89 (11.5) | 61 ( 9.0) | 87 ( 9.4) | 75 ( 9.1) | 76 ( 9.6) | 59 ( 9.5) | 297 ( 9.4) |
| Unknown | 18 | 16 | 15 | 16 | 23 | 20 | 15 | 7 | 65 |
| Stage | |||||||||
| II | 559 (65.5) | 543 (60.5) | 454 (57.5) | 388 (55.9) | 621 (65.2) | 501 (59.3) | 475 (58.8) | 347 (55.1) | 1,944 (60.1) |
| III | 295 (34.5) | 354 (39.5) | 336 (42.5) | 306 (44.1) | 331 (34.8) | 344 (40.7) | 333 (41.2) | 283 (44.9) | 1,291 (39.9) |
| Tumor Grade | |||||||||
| Well differentiated | 88 (10.8) | 82 ( 9.5) | 63 ( 8.4) | 68 (10.2) | 82 ( 8.9) | 65 ( 8.1) | 88 (11.4) | 66 (11.0) | 301 ( 9.7) |
| Moderately differentiated | 343 (41.9) | 348 (40.5) | 310 (41.1) | 260 (39.0) | 364 (39.4) | 314 (39.2) | 325 (42.2) | 258 (42.9) | 1,261 (40.7) |
| Poor/Undifferentiated | 387 (47.3) | 430 (50.0) | 381 (50.5) | 338 (50.8) | 478 (51.7) | 423 (52.7) | 358 (46.4) | 277 (46.1) | 1,536 (49.6) |
| Unknown | 36 | 37 | 36 | 28 | 28 | 43 | 37 | 29 | 137 |
| Surgery | |||||||||
| None | 43 ( 5.0) | 48 ( 5.4) | 50 ( 6.3) | 36 ( 5.2) | 48 ( 5.0) | 54 ( 6.4) | 40 ( 5.0) | 35 ( 5.6) | 177 ( 5.5) |
| Lumpectomy | 249 (29.2) | 305 (34.0) | 281 (35.6) | 257 (37.0) | 268 (28.2) | 302 (35.7) | 308 (38.1) | 214 (34.0) | 1,092 (33.8) |
| Mastectomy | 562 (65.8) | 544 (60.6) | 459 (58.1) | 401 (57.8) | 636 (66.8) | 489 (57.9) | 460 (56.9) | 381 (60.5) | 1,966 (60.8) |
| ER/PR status | |||||||||
| Both negative | 217 (25.4) | 242 (27.0) | 209 (26.5) | 188 (27.1) | 262 (27.5) | 249 (29.5) | 208 (25.7) | 137 (21.7) | 856 (26.5) |
| Either positive | 637 (74.6) | 655 (73.0) | 581 (73.5) | 506 (72.9) | 690 (72.5) | 596 (70.5) | 600 (74.3) | 493 (78.3) | 2,379 (73.5) |
| HER-2 Status | |||||||||
| Negative | 596 (69.8) | 657 (73.2) | 572 (72.4) | 552 (79.5) | 657 (69.0) | 613 (72.5) | 611 (75.5) | 498 (79.0) | 2,377 (73.5) |
| Positive | 209 (24.5) | 191 (21.3) | 167 (21.1) | 106 (15.3) | 248 (26.1) | 182 (21.5) | 154 (19.0) | 89 (14.1) | 673 (20.8) |
| Equivocal | 49 ( 5.7) | 49 ( 5.5) | 51 ( 6.5) | 36 ( 5.2) | 47 ( 4.9) | 51 ( 6.0) | 44 ( 5.4) | 43 ( 6.8) | 185 ( 5.7) |
| Muscle area in cm2 [mean (sd)] | 105.24 (16.12) | 110.86 (16.86) | 117.95 (17.73) | 129.77 (21.37) | 108.28 (16.36) | 111.83 (17.90) | 117.65 (19.36) | 126.86 (22.64) | 115.17 (20.01) |
| BMI [mean (sd)] | 22.19 (2.55) | 26.01 (3.02) | 29.62 (3.42) | 36.57 (5.74) | 22.92 (3.22) | 26.69 (3.88) | 30.22 (5.13) | 35.35 (6.08) | 28.15 (6.37) |