Table 3.
Associations between patient and tumour characteristics in black vs non-black women diagnosed at age ≤ 50 vs > 50 years
| Black | Non-black | |||
| Patient/tumour characteristic (p-value*) | age ≤50 years (premenopausal) |
age >50 years (postmenopausal) |
age ≤50 years (premenopausal) |
age >50 years (postmenopausal) |
| n (%) | n (%) | n (%) | n (%) | |
| BMI (0.03) | ||||
| Underweight/normal (<25) | 10 (20) | 22 (17) | 23 (33) | 40 (24) |
| Overweight (25 to <30) | 16 (31) | 31 (25) | 20 (29) | 55 (32) |
| Obesity I (30 to <35) | 13 (25) | 42 (33) | 14 (20) | 42 (25) |
| Obesity II (35 to <40) | 4 (7.8) | 22 (17) | 9 (13) | 16 (9.4) |
| Obesity III (≥ 40) Missing |
8 (16) 0 (0) |
7 (5.6) 2 (1.6) |
2 (2.9) 1 (1.5) |
12 (7.1) 5 (2.9) |
| Immunophenotype (<0.0001) | ||||
| Triple negative | 16 (31) | 36 (29) | 12 (17) | 17 (10) |
| Other Missing |
35 (69) 0 (0) |
8 (70) 2 (1.6) |
56 (81) 1 (1.5) |
151 (89) 2 (1.2) |
| Grade (0.06) | ||||
| 1 | 3 (5.9) | 11 (8.7) | 13 (19) | 27 (16) |
| 2 | 19 (37) | 53 (42) | 25 (36) | 80 (47) |
| 3 Missing |
26 (51) 3 (5.9) |
52 (41) 10 (7.9) |
30 (44) 1 (1.5) |
56 (33) 7 (4.1) |
| Nodal involvement (0.03) | ||||
| Node negative | 13 (25) | 48 (38) | 31 (45) | 51 (30) |
| Node positive Missing |
29 (57) 9 (18) |
52 (41) 26 (21) |
30 (43) 8 (12) |
71 (42) 48 (28) |
| Total number (%) of all patients | 51 (12) | 126 (30) | 69 (17) | 170 (41) |
* test of homogeneity of proportions.
BMI = body mass index.