Table 1 Baseline features of patients with PND
Characteristics N = 87 | Benign N = 59 (%) | Atypical or Malignant N = 28 (%) | χ2 | P-Value |
|---|---|---|---|---|
Age, y, M (Q25, Q75) | 50.0 (36.0, 53.0) | 51.5 (47.5, 59.0) | 2.56 | 0.011 |
≤ 50 | 40 (67.8) | 13 (46.4) | 3.64 | 0.046 |
> 50 | 19 (32.2) | 15 (53.6) | ||
Location | ||||
Central | 38 (64.4) | 15 (53.6) | 1.65 | 0.199 |
Peripheral | 21 (35.6) | 13 (46.4) | ||
Size, mm, M (Q25,Q75) | 8.6 (7.6, 11.0) | 11.7 (8.8, 15.5) | 2.90 | 0.004 |
≤ 10 | 39 (66.1) | 10 (35.7) | 7.13 | 0.008 |
> 10 | 20 (33.9) | 18 (64.3) | ||
Discharge color | ||||
Bloody | 10 (16.9) | 11 (39.3) | 5.17 | 0.023 |
Non-bloody | 49 (83.1) | 17 (60.7) | ||
Ductal ectasia | ||||
Present | 24 (40.7) | 7 (25.0) | 2.04 | 0.154 |
Absent | 35 (59.3) | 21 (75.0) | ||
Lactation history | ||||
Yes | 53 (89.8) | 24 (85.7) | 0.32 | 0.574 |
No | 6 (10.2) | 4 (14.3) |