Table 1.
Clinical characteristics of the study group, comparing patients with primary tumors in EXL (external quadrants and axillary tail), INL (internal quadrants), and NAL (nipple and areola) locations.
| Clinical characteristics | EXL | INL | NAL | p value |
|---|---|---|---|---|
| N = 160 | N = 58 | N = 17 | ||
| Age, years | 0.941Ω | |||
| Minimum | 32 | 43 | 49 | |
| Maximum | 78 | 79 | 79 | |
| Mean ± SD | 59 ± 8.6 | 60 ± 8.5 | 60 ± 6.1 | |
|
| ||||
| Parity (%) | 0.424¥ | |||
| Nulliparity | 8.8% (n = 14) | 6.9% (n = 4) | 0% (n = 0) | |
| Multiparity | 66.0% (n = 106) | 67.3% (n = 39) | 92.9% (16) | |
|
| ||||
| Breastfeeding, months | 0.653Ω | |||
| Minimum | 0 | 0 | 0 | |
| Maximum | 72 | 66 | 48 | |
| Mean ± SD | 8.8 ± 13.9 | 8.8 ± 13.9 | 11.9 ± 16.4 | |
|
| ||||
| Menopausal status (%) | 0.767¥ | |||
| Premenopausal | 18.8% (n = 30) | 17.2% (n = 10) | 11.8% (n = 2) | |
| Postmenopausal | 81.2% (n = 130) | 82.8% (n = 48) | 88.2% (n = 15) | |
|
| ||||
| Age of menopause, years | 0.171Ω | |||
| Minimum | 37 | 46 | 44 | |
| Maximum | 60 | 56 | 52 | |
| Mean ± SD | 50 ± 4.1 | 49 ± 5.8 | 49 ± 2.9 | |
|
| ||||
| Postmenopausal hormone therapy (%) | 3.8% (n = 6) | 5.2% (n = 3) | 0.0% (n = 0) | 0.258¥ |
|
| ||||
| Smoker (%) | 11.3% (n = 18) | 3.4% (n = 2) | 5.9% (n = 1) | 0.167¥ |
|
| ||||
| Palpability (%) | 0.062¥ | |||
| Nonpalpable | 59.4% (n = 95) | 70.7% (n = 41) | 82.4% (n = 14) | |
| Palpable | 40.6% (n = 65) | 29.3% (n = 17) | 17.6% (n = 3) | |
Note: ¥: chi-square test, Ω: one-way ANOVA.
Abbreviation: SD, standard deviation.