Table 3. Association between ethnic groups and lymph node involvement by tumor size in 3,712 Asian women with breast cancer.a .
| Ethnicity | P valueb | |||
| Chinese | Malay | Indian | ||
| Tumor size less than 20 mm (N = 937) | 0.004 | |||
| No nodal involvement, N (%) | 568 (77·0) | 84 (64·6) | 57 (82·6) | |
| Lymph node involvement, N (%) | 170 (23·0) | 46 (35·4) | 12 (17·4) | |
| Adjusted odds ratio for lymph node involvementc (95% confidence interval) | 1.00 | 1·57 (1·05–2·37) | 0·64 (0·33–1·24) | |
| Tumor size 20–50 mm (N = 2,228) | 0.002 | |||
| No nodal involvement, N (%) | 865 (53·8) | 160 (43·7) | 125 (49·0) | |
| Lymph node involvement, N (%) | 742 (46·2) | 206 (56·3) | 130 (51·0) | |
| Adjusted odds ratio for lymph node involvementc (95% confidence interval) | 1.00 | 1·45 (1·15–1·84) | 1·18 (0·89–1·55) | |
| Tumor size more than 50 mm (N = 547) | 0.215 | |||
| No nodal involvement, N (%) | 105 (30·9) | 34 (25·2) | 16 (2·2) | |
| Lymph node involvement, N (%) | 235 (69·1) | 101 (74·8) | 56 (77·8) | |
| Adjusted odds ratio for lymph node involvementc (95% confidence interval) | 1.00 | 1·40 (0·88–2·23) | 1·69 (0·92–3·13) | |
a
Only including patients with pathologically confirmed tumor size and lymph node status.
b
Using Chi Square test.
c
Logistic regression model adjusted for absolute tumor size (mm), tumor grade, estrogen receptor status, and progesterone receptor status.